Class RegularExpression
- All Implemented Interfaces:
Serializable
How to use
- A. Standard way
-
RegularExpression re = new RegularExpression(regex); if (re.matches(text)) { ... }
- B. Capturing groups
-
RegularExpression re = new RegularExpression(regex); Match match = new Match(); if (re.matches(text, match)) { ... // You can refer captured texts with methods of the
Match
class. }
Case-insensitive matching
RegularExpression re = new RegularExpression(regex, "i"); if (re.matches(text) >= 0) { ...}
Options
You can specify options to RegularExpression(
regex,
options)
or setPattern(
regex,
options)
.
This options parameter consists of the following characters.
"i"
- This option indicates case-insensitive matching.
"m"
- ^ and $ consider the EOL characters within the text.
"s"
- . matches any one character.
"u"
- Redefines \d \D \w \W \s \S \b \B \< \> as becoming to Unicode.
"w"
- By this option, \b \B \< \> are processed with the method of 'Unicode Regular Expression Guidelines' Revision 4. When "w" and "u" are specified at the same time, \b \B \< \> are processed for the "w" option.
","
- The parser treats a comma in a character class as a range separator. [a,b] matches a or , or b without this option. [a,b] matches a or b with this option.
"X"
-
By this option, the engine confoms to XML Schema: Regular Expression.
The
match()
method does not do subsring matching but entire string matching.
Syntax
Differences from the Perl 5 regular expression
|
Meta characters are `. * + ? { [ ( ) | \ ^ $'.
- Character
- . (A period)
- Matches any one character except the following characters.
- LINE FEED (U+000A), CARRIAGE RETURN (U+000D), PARAGRAPH SEPARATOR (U+2029), LINE SEPARATOR (U+2028)
- This expression matches one code point in Unicode. It can match a pair of surrogates.
- When the "s" option is specified, it matches any character including the above four characters.
- LINE FEED (U+000A), CARRIAGE RETURN (U+000D), PARAGRAPH SEPARATOR (U+2029), LINE SEPARATOR (U+2028)
- \e \f \n \r \t
- Matches ESCAPE (U+001B), FORM FEED (U+000C), LINE FEED (U+000A), CARRIAGE RETURN (U+000D), HORIZONTAL TABULATION (U+0009)
- \cC
- Matches a control character.
The C must be one of '@', 'A'-'Z',
'[', '\', ']', '^', '_'.
It matches a control character of which the character code is less than
the character code of the C by 0x0040.
- For example, a \cJ matches a LINE FEED (U+000A), and a \c[ matches an ESCAPE (U+001B).
- a non-meta character
- Matches the character.
- \ + a meta character
- Matches the meta character.
- \xHH \x{HHHH}
- Matches a character of which code point is HH (Hexadecimal) in Unicode. You can write just 2 digits for \xHH, and variable length digits for \x{HHHH}.
- \vHHHHHH
- Matches a character of which code point is HHHHHH (Hexadecimal) in Unicode.
- \g
- Matches a grapheme.
- It is equivalent to (?[\p{ASSIGNED}]-[\p{M}\p{C}])?(?:\p{M}|[\x{094D}\x{09CD}\x{0A4D}\x{0ACD}\x{0B3D}\x{0BCD}\x{0C4D}\x{0CCD}\x{0D4D}\x{0E3A}\x{0F84}]\p{L}|[\x{1160}-\x{11A7}]|[\x{11A8}-\x{11FF}]|[\x{FF9E}\x{FF9F}])*
- \X
- Matches a combining character sequence. It is equivalent to (?:\PM\pM*)
- Character class
-
+ *
- [R1R2...Rn] (without "," option)
+ *
- [R1,R2,...,Rn] (with "," option)
- Positive character class. It matches a character in ranges.
- Rn:
- A character (including \e \f \n \r \t \xHH \x{HHHH} \vHHHHHH)
This range matches the character.
- C1-C2
This range matches a character which has a code point that is >= C1's code point and <= C2's code point. + *
- A POSIX character class: [:alpha:] [:alnum:] [:ascii:] [:cntrl:] [:digit:] [:graph:] [:lower:] [:print:] [:punct:] [:space:] [:upper:] [:xdigit:],
+ * and negative POSIX character classes in Perl like [:^alpha:]
...
- \d \D \s \S \w \W \p{name} \P{name}
These expressions specifies the same ranges as the following expressions.
Enumerated ranges are merged (union operation). [a-ec-z] is equivalent to [a-z]
- Rn:
- [^R1R2...Rn] (without a "," option)
- [^R1,R2,...,Rn] (with a "," option)
- Negative character class. It matches a character not in ranges.
- (?[ranges]op[ranges]op[ranges] ... ) (op is - or + or &.)
- Subtraction or union or intersection for character classes.
- For exmaple, (?[A-Z]-[CF]) is equivalent to [A-BD-EG-Z], and (?[0x00-0x7f]-[K]&[\p{Lu}]) is equivalent to [A-JL-Z].
- The result of this operations is a positive character class even if an expression includes any negative character classes. You have to take care on this in case-insensitive matching. For instance, (?[^b]) is equivalent to [\x00-ac-\x{10ffff}], which is equivalent to [^b] in case-sensitive matching. But, in case-insensitive matching, (?[^b]) matches any character because it includes 'B' and 'B' matches 'b' though [^b] is processed as [^Bb].
- For exmaple, (?[A-Z]-[CF]) is equivalent to [A-BD-EG-Z], and (?[0x00-0x7f]-[K]&[\p{Lu}]) is equivalent to [A-JL-Z].
- [R1R2...-[RnRn+1...]] (with an "X" option)
- Character class subtraction for the XML Schema. You can use this syntax when you specify an "X" option.
- \d
- Equivalent to [0-9].
- When a "u" option is set, it is equivalent to \p{Nd}.
- \D
- Equivalent to [^0-9]
- When a "u" option is set, it is equivalent to \P{Nd}.
- \s
- Equivalent to [ \f\n\r\t]
- When a "u" option is set, it is equivalent to [ \f\n\r\t\p{Z}].
- \S
- Equivalent to [^ \f\n\r\t]
- When a "u" option is set, it is equivalent to [^ \f\n\r\t\p{Z}].
- \w
- Equivalent to [a-zA-Z0-9_]
- When a "u" option is set, it is equivalent to [\p{Lu}\p{Ll}\p{Lo}\p{Nd}_].
- \W
- Equivalent to [^a-zA-Z0-9_]
- When a "u" option is set, it is equivalent to [^\p{Lu}\p{Ll}\p{Lo}\p{Nd}_].
- \p{name}
- Matches one character in the specified General Category (the second field in UnicodeData.txt) or the specified Block.
The following names are available:
- Unicode General Categories:
-
L, M, N, Z, C, P, S, Lu, Ll, Lt, Lm, Lo, Mn, Me, Mc, Nd, Nl, No, Zs, Zl, Zp,
Cc, Cf, Cn, Co, Cs, Pd, Ps, Pe, Pc, Po, Sm, Sc, Sk, So,
- (Currently the Cn category includes U+10000-U+10FFFF characters)
- Unicode Blocks:
- Basic Latin, Latin-1 Supplement, Latin Extended-A, Latin Extended-B, IPA Extensions, Spacing Modifier Letters, Combining Diacritical Marks, Greek, Cyrillic, Armenian, Hebrew, Arabic, Devanagari, Bengali, Gurmukhi, Gujarati, Oriya, Tamil, Telugu, Kannada, Malayalam, Thai, Lao, Tibetan, Georgian, Hangul Jamo, Latin Extended Additional, Greek Extended, General Punctuation, Superscripts and Subscripts, Currency Symbols, Combining Marks for Symbols, Letterlike Symbols, Number Forms, Arrows, Mathematical Operators, Miscellaneous Technical, Control Pictures, Optical Character Recognition, Enclosed Alphanumerics, Box Drawing, Block Elements, Geometric Shapes, Miscellaneous Symbols, Dingbats, CJK Symbols and Punctuation, Hiragana, Katakana, Bopomofo, Hangul Compatibility Jamo, Kanbun, Enclosed CJK Letters and Months, CJK Compatibility, CJK Unified Ideographs, Hangul Syllables, High Surrogates, High Private Use Surrogates, Low Surrogates, Private Use, CJK Compatibility Ideographs, Alphabetic Presentation Forms, Arabic Presentation Forms-A, Combining Half Marks, CJK Compatibility Forms, Small Form Variants, Arabic Presentation Forms-B, Specials, Halfwidth and Fullwidth Forms
- Others:
- ALL (Equivalent to [\u0000-\v10FFFF])
- ASSGINED (\p{ASSIGNED} is equivalent to \P{Cn})
- UNASSGINED (\p{UNASSIGNED} is equivalent to \p{Cn})
- ASSGINED (\p{ASSIGNED} is equivalent to \P{Cn})
- \P{name}
- Matches one character not in the specified General Category or the specified Block.
- [R1R2...Rn] (without "," option)
+ *
- Selection and Quantifier
- X|Y
- ...
- X*
- Matches 0 or more X.
- X+
- Matches 1 or more X.
- X?
- Matches 0 or 1 X.
- X{number}
- Matches number times.
- X{min,}
- ...
- X{min,max}
- ...
- X*?
- X+?
- X??
- X{min,}?
- X{min,max}?
- X+?
- Non-greedy matching.
- Grouping, Capturing, and Back-reference
- (?:X)
- Grouping. "foo+" matches "foo" or "foooo". If you want it matches "foofoo" or "foofoofoo", you have to write "(?:foo)+".
- (X)
- Grouping with capturing.
It make a group and applications can know
where in target text a group matched with methods of a
Match
instance aftermatches(String,Match)
. The 0th group means whole of this regular expression. The Nth gorup is the inside of the Nth left parenthesis.For instance, a regular expression is " *([^<:]*) +<([^>]*)> *" and target text is "From: TAMURA Kent <kent@trl.ibm.co.jp>":
Match.getCapturedText(0)
: " TAMURA Kent <kent@trl.ibm.co.jp>"Match.getCapturedText(1)
: "TAMURA Kent"Match.getCapturedText(2)
: "kent@trl.ibm.co.jp"
- \1 \2 \3 \4 \5 \6 \7 \8 \9
- (?>X)
- Independent expression group. ................
- (?options:X)
- (?options-options2:X)
- ............................
- The options or the options2 consists of 'i' 'm' 's' 'w'. Note that it can not contain 'u'.
- (?options)
- (?options-options2)
- ......
- These expressions must be at the beginning of a group.
- Anchor
- \A
- Matches the beginnig of the text.
- \Z
- Matches the end of the text, or before an EOL character at the end of the text, or CARRIAGE RETURN + LINE FEED at the end of the text.
- \z
- Matches the end of the text.
- ^
- Matches the beginning of the text. It is equivalent to \A.
- When a "m" option is set, it matches the beginning of the text, or after one of EOL characters ( LINE FEED (U+000A), CARRIAGE RETURN (U+000D), LINE SEPARATOR (U+2028), PARAGRAPH SEPARATOR (U+2029).)
- $
- Matches the end of the text, or before an EOL character at the end of the text,
or CARRIAGE RETURN + LINE FEED at the end of the text.
- When a "m" option is set, it matches the end of the text, or before an EOL character.
- \b
- Matches word boundary. (See a "w" option)
- \B
- Matches non word boundary. (See a "w" option)
- \<
- Matches the beginning of a word. (See a "w" option)
- \>
- Matches the end of a word. (See a "w" option)
- Lookahead and lookbehind
- (?=X)
- Lookahead.
- (?!X)
- Negative lookahead.
- (?<=X)
- Lookbehind.
- (Note for text capturing......)
- (?<!X)
- Negative lookbehind.
- Misc.
- (?(condition)yes-pattern|no-pattern),
- (?(condition)yes-pattern)
- ......
- (?#comment)
- Comment. A comment string consists of characters except ')'. You can not write comments in character classes and before quantifiers.
- (?(condition)yes-pattern|no-pattern),
BNF for the regular expression
regex ::= ('(?' options ')')? term ('|' term)* term ::= factor+ factor ::= anchors | atom (('*' | '+' | '?' | minmax ) '?'? )? | '(?#' [^)]* ')' minmax ::= '{' ([0-9]+ | [0-9]+ ',' | ',' [0-9]+ | [0-9]+ ',' [0-9]+) '}' atom ::= char | '.' | char-class | '(' regex ')' | '(?:' regex ')' | '\' [0-9] | '\w' | '\W' | '\d' | '\D' | '\s' | '\S' | category-block | '\X' | '(?>' regex ')' | '(?' options ':' regex ')' | '(?' ('(' [0-9] ')' | '(' anchors ')' | looks) term ('|' term)? ')' options ::= [imsw]* ('-' [imsw]+)? anchors ::= '^' | '$' | '\A' | '\Z' | '\z' | '\b' | '\B' | '\<' | '\>' looks ::= '(?=' regex ')' | '(?!' regex ')' | '(?<=' regex ')' | '(?<!' regex ')' char ::= '\\' | '\' [efnrtv] | '\c' [@-_] | code-point | character-1 category-block ::= '\' [pP] category-symbol-1 | ('\p{' | '\P{') (category-symbol | block-name | other-properties) '}' category-symbol-1 ::= 'L' | 'M' | 'N' | 'Z' | 'C' | 'P' | 'S' category-symbol ::= category-symbol-1 | 'Lu' | 'Ll' | 'Lt' | 'Lm' | Lo' | 'Mn' | 'Me' | 'Mc' | 'Nd' | 'Nl' | 'No' | 'Zs' | 'Zl' | 'Zp' | 'Cc' | 'Cf' | 'Cn' | 'Co' | 'Cs' | 'Pd' | 'Ps' | 'Pe' | 'Pc' | 'Po' | 'Sm' | 'Sc' | 'Sk' | 'So' block-name ::= (See above) other-properties ::= 'ALL' | 'ASSIGNED' | 'UNASSIGNED' character-1 ::= (any character except meta-characters) char-class ::= '[' ranges ']' | '(?[' ranges ']' ([-+&] '[' ranges ']')? ')' ranges ::= '^'? (range ','?)+ range ::= '\d' | '\w' | '\s' | '\D' | '\W' | '\S' | category-block | range-char | range-char '-' range-char range-char ::= '\[' | '\]' | '\\' | '\' [,-efnrtv] | code-point | character-2 code-point ::= '\x' hex-char hex-char | '\x{' hex-char+ '}' | '\v' hex-char hex-char hex-char hex-char hex-char hex-char hex-char ::= [0-9a-fA-F] character-2 ::= (any character except \[]-,)
TODO
- Unicode Regular Expression Guidelines
- 2.4 Canonical Equivalents
- Level 3
- Parsing performance
- Version:
- RegularExpression.java,v 1.7 2003/07/15 12:28:25 neeraj Exp
-
Nested Class Summary
Nested Classes -
Field Summary
FieldsModifier and TypeFieldDescription(package private) static final int
(package private) RegularExpression.Context
(package private) static final boolean
(package private) static final int
"x"(package private) RangeToken
(package private) String
(package private) boolean
(package private) int
(package private) BMPattern
(package private) boolean
(package private) static final int
"i"(package private) static final int
(package private) static final int
(package private) int
(package private) static final int
"m"(package private) int
The number of parenthesis in the regular expression.(package private) int
(package private) Op
(package private) int
(package private) static final int
(package private) static final int
"F"(package private) static final int
"H"(package private) String
A regular expression.(package private) static final int
"s"(package private) static final int
",".(package private) Token
Internal representation of the regular expression.(package private) static final int
An option.(package private) static final int
This option redefines \d \D \w \W \s \S.private static final int
private static final int
private static final int
(package private) static final int
"X". -
Constructor Summary
ConstructorsConstructorDescriptionRegularExpression
(String regex) Creates a new RegularExpression instance.RegularExpression
(String regex, Token tok, int parens, boolean hasBackReferences, int options) RegularExpression
(String regex, String options) Creates a new RegularExpression instance with options. -
Method Summary
Modifier and TypeMethodDescriptionprivate void
Compiles a token tree into an operation flow.private Op
Converts a token to an operation.boolean
Return true if patterns are the same and the options are equivalent.(package private) boolean
int
Return the number of regular expression groups.Returns a option string.private static final int
getPreviousWordType
(char[] target, int begin, int end, int offset, int opts) private static final int
getPreviousWordType
(String target, int begin, int end, int offset, int opts) private static final int
getPreviousWordType
(CharacterIterator target, int begin, int end, int offset, int opts) private static final int
getWordType
(char[] target, int begin, int end, int offset, int opts) private static final int
getWordType
(String target, int begin, int end, int offset, int opts) private static final int
getWordType
(CharacterIterator target, int begin, int end, int offset, int opts) private static final int
getWordType0
(char ch, int opts) int
hashCode()
private static final boolean
isEOLChar
(int ch) private static final boolean
isSet
(int options, int flag) private static final boolean
isWordChar
(int ch) private int
matchCharacterIterator
(RegularExpression.Context con, Op op, int offset, int dx, int opts) private int
matchCharArray
(RegularExpression.Context con, Op op, int offset, int dx, int opts) boolean
matches
(char[] target) Checks whether the target text contains this pattern or not.boolean
matches
(char[] target, int start, int end) Checks whether the target text contains this pattern in specified range or not.boolean
Checks whether the target text contains this pattern in specified range or not.boolean
Checks whether the target text contains this pattern or not.boolean
Checks whether the target text contains this pattern or not.boolean
Checks whether the target text contains this pattern in specified range or not.boolean
Checks whether the target text contains this pattern in specified range or not.boolean
Checks whether the target text contains this pattern or not.boolean
matches
(CharacterIterator target) Checks whether the target text contains this pattern or not.boolean
matches
(CharacterIterator target, Match match) Checks whether the target text contains this pattern or not.private static final boolean
matchIgnoreCase
(int chardata, int ch) private int
matchString
(RegularExpression.Context con, Op op, int offset, int dx, int opts) (package private) void
prepare()
Prepares for matching.private static final boolean
regionMatches
(char[] target, int offset, int limit, int offset2, int partlen) private static final boolean
regionMatches
(char[] target, int offset, int limit, String part, int partlen) private static final boolean
regionMatches
(String text, int offset, int limit, int offset2, int partlen) private static final boolean
regionMatches
(String text, int offset, int limit, String part, int partlen) private static final boolean
regionMatches
(CharacterIterator target, int offset, int limit, int offset2, int partlen) private static final boolean
regionMatches
(CharacterIterator target, int offset, int limit, String part, int partlen) private static final boolean
regionMatchesIgnoreCase
(char[] target, int offset, int limit, int offset2, int partlen) private static final boolean
regionMatchesIgnoreCase
(char[] target, int offset, int limit, String part, int partlen) private static final boolean
regionMatchesIgnoreCase
(String text, int offset, int limit, int offset2, int partlen) private static final boolean
regionMatchesIgnoreCase
(String text, int offset, int limit, String part, int partlen) private static final boolean
regionMatchesIgnoreCase
(CharacterIterator target, int offset, int limit, int offset2, int partlen) private static final boolean
regionMatchesIgnoreCase
(CharacterIterator target, int offset, int limit, String part, int partlen) void
setPattern
(String newPattern) private void
setPattern
(String newPattern, int options) void
setPattern
(String newPattern, String options) toString()
Represents this instence in String.
-
Field Details
-
DEBUG
static final boolean DEBUG- See Also:
-
regex
String regexA regular expression. -
options
int options -
nofparen
int nofparenThe number of parenthesis in the regular expression. -
tokentree
Token tokentreeInternal representation of the regular expression. -
hasBackReferences
boolean hasBackReferences -
minlength
transient int minlength -
operations
-
numberOfClosures
transient int numberOfClosures -
context
-
firstChar
-
fixedString
-
fixedStringOptions
transient int fixedStringOptions -
fixedStringTable
-
fixedStringOnly
transient boolean fixedStringOnly -
IGNORE_CASE
static final int IGNORE_CASE"i"- See Also:
-
SINGLE_LINE
static final int SINGLE_LINE"s"- See Also:
-
MULTIPLE_LINES
static final int MULTIPLE_LINES"m"- See Also:
-
EXTENDED_COMMENT
static final int EXTENDED_COMMENT"x"- See Also:
-
USE_UNICODE_CATEGORY
static final int USE_UNICODE_CATEGORYThis option redefines \d \D \w \W \s \S. -
UNICODE_WORD_BOUNDARY
static final int UNICODE_WORD_BOUNDARYAn option. This enables to process locale-independent word boundary for \b \B \< \>.By default, the engine considers a position between a word character (\w) and a non word character is a word boundary.
By this option, the engine checks word boundaries with the method of 'Unicode Regular Expression Guidelines' Revision 4.
-
PROHIBIT_HEAD_CHARACTER_OPTIMIZATION
static final int PROHIBIT_HEAD_CHARACTER_OPTIMIZATION"H"- See Also:
-
PROHIBIT_FIXED_STRING_OPTIMIZATION
static final int PROHIBIT_FIXED_STRING_OPTIMIZATION"F"- See Also:
-
XMLSCHEMA_MODE
static final int XMLSCHEMA_MODE"X". XML Schema mode.- See Also:
-
SPECIAL_COMMA
static final int SPECIAL_COMMA",".- See Also:
-
WT_IGNORE
private static final int WT_IGNORE- See Also:
-
WT_LETTER
private static final int WT_LETTER- See Also:
-
WT_OTHER
private static final int WT_OTHER- See Also:
-
LINE_FEED
static final int LINE_FEED- See Also:
-
CARRIAGE_RETURN
static final int CARRIAGE_RETURN- See Also:
-
LINE_SEPARATOR
static final int LINE_SEPARATOR- See Also:
-
PARAGRAPH_SEPARATOR
static final int PARAGRAPH_SEPARATOR- See Also:
-
-
Constructor Details
-
RegularExpression
Creates a new RegularExpression instance.- Parameters:
regex
- A regular expression- Throws:
ParseException
- regex is not conforming to the syntax.
-
RegularExpression
Creates a new RegularExpression instance with options.- Parameters:
regex
- A regular expressionoptions
- A String consisted of "i" "m" "s" "u" "w" "," "X"- Throws:
ParseException
- regex is not conforming to the syntax.
-
RegularExpression
-
-
Method Details
-
compile
Compiles a token tree into an operation flow. -
compile
Converts a token to an operation. -
matches
public boolean matches(char[] target) Checks whether the target text contains this pattern or not.- Returns:
- true if the target is matched to this regular expression.
-
matches
public boolean matches(char[] target, int start, int end) Checks whether the target text contains this pattern in specified range or not.- Parameters:
start
- Start offset of the range.end
- End offset +1 of the range.- Returns:
- true if the target is matched to this regular expression.
-
matches
Checks whether the target text contains this pattern or not.- Parameters:
match
- A Match instance for storing matching result.- Returns:
- Offset of the start position in target; or -1 if not match.
-
matches
Checks whether the target text contains this pattern in specified range or not.- Parameters:
start
- Start offset of the range.end
- End offset +1 of the range.match
- A Match instance for storing matching result.- Returns:
- Offset of the start position in target; or -1 if not match.
-
matchCharArray
- Returns:
- -1 when not match; offset of the end of matched string when match.
-
getPreviousWordType
private static final int getPreviousWordType(char[] target, int begin, int end, int offset, int opts) -
getWordType
private static final int getWordType(char[] target, int begin, int end, int offset, int opts) -
regionMatches
private static final boolean regionMatches(char[] target, int offset, int limit, String part, int partlen) -
regionMatches
private static final boolean regionMatches(char[] target, int offset, int limit, int offset2, int partlen) -
regionMatchesIgnoreCase
private static final boolean regionMatchesIgnoreCase(char[] target, int offset, int limit, String part, int partlen) -
regionMatchesIgnoreCase
private static final boolean regionMatchesIgnoreCase(char[] target, int offset, int limit, int offset2, int partlen) -
matches
Checks whether the target text contains this pattern or not.- Returns:
- true if the target is matched to this regular expression.
-
matches
Checks whether the target text contains this pattern in specified range or not.- Parameters:
start
- Start offset of the range.end
- End offset +1 of the range.- Returns:
- true if the target is matched to this regular expression.
-
matches
Checks whether the target text contains this pattern or not.- Parameters:
match
- A Match instance for storing matching result.- Returns:
- Offset of the start position in target; or -1 if not match.
-
matches
Checks whether the target text contains this pattern in specified range or not.- Parameters:
start
- Start offset of the range.end
- End offset +1 of the range.match
- A Match instance for storing matching result.- Returns:
- Offset of the start position in target; or -1 if not match.
-
matchString
- Returns:
- -1 when not match; offset of the end of matched string when match.
-
getPreviousWordType
private static final int getPreviousWordType(String target, int begin, int end, int offset, int opts) -
getWordType
-
regionMatches
-
regionMatches
private static final boolean regionMatches(String text, int offset, int limit, int offset2, int partlen) -
regionMatchesIgnoreCase
-
regionMatchesIgnoreCase
private static final boolean regionMatchesIgnoreCase(String text, int offset, int limit, int offset2, int partlen) -
matches
Checks whether the target text contains this pattern or not.- Returns:
- true if the target is matched to this regular expression.
-
matches
Checks whether the target text contains this pattern or not.- Parameters:
match
- A Match instance for storing matching result.- Returns:
- Offset of the start position in target; or -1 if not match.
-
matchCharacterIterator
private int matchCharacterIterator(RegularExpression.Context con, Op op, int offset, int dx, int opts) - Returns:
- -1 when not match; offset of the end of matched string when match.
-
getPreviousWordType
private static final int getPreviousWordType(CharacterIterator target, int begin, int end, int offset, int opts) -
getWordType
private static final int getWordType(CharacterIterator target, int begin, int end, int offset, int opts) -
regionMatches
private static final boolean regionMatches(CharacterIterator target, int offset, int limit, String part, int partlen) -
regionMatches
private static final boolean regionMatches(CharacterIterator target, int offset, int limit, int offset2, int partlen) -
regionMatchesIgnoreCase
private static final boolean regionMatchesIgnoreCase(CharacterIterator target, int offset, int limit, String part, int partlen) -
regionMatchesIgnoreCase
private static final boolean regionMatchesIgnoreCase(CharacterIterator target, int offset, int limit, int offset2, int partlen) -
prepare
void prepare()Prepares for matching. This method is called just before starting matching. -
isSet
private static final boolean isSet(int options, int flag) -
setPattern
- Throws:
ParseException
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setPattern
- Throws:
ParseException
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setPattern
- Throws:
ParseException
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getPattern
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toString
Represents this instence in String. -
getOptions
Returns a option string. The order of letters in it may be different from a string specified in a constructor orsetPattern()
. -
equals
Return true if patterns are the same and the options are equivalent. -
equals
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hashCode
public int hashCode() -
getNumberOfGroups
public int getNumberOfGroups()Return the number of regular expression groups. This method returns 1 when the regular expression has no capturing-parenthesis. -
getWordType0
private static final int getWordType0(char ch, int opts) -
isEOLChar
private static final boolean isEOLChar(int ch) -
isWordChar
private static final boolean isWordChar(int ch) -
matchIgnoreCase
private static final boolean matchIgnoreCase(int chardata, int ch)
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