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正则表达式速查表
2016-08-29 | 阅:  转:  |  分享 
  
正则表达式速查表

元字符 说明 ^ 匹配字符串的开始位置 $ 匹配字符串的结束位置 . 匹配任意单个字符(换行符\n除外) | 交替 {…} 指定要限定的数量 [...] 指定要匹配的字符集 (…) 对表达式进行逻辑分组 匹配零或多个前面的表达式 + 匹配一或多个前面的表达式 ? 匹配零或一个前面的表达式 \ 放在上面任何一个字符之前,表示匹配该字符本身。放在其他特殊字符后面,表示字符转义(见下面) 字符转义 说明 原始字符 除.$^{[(|)]}+?\之外的字符均匹配自身 \a 匹配铃声(闹铃)\u0007 \b 在[]中匹配一个空格\u0008,在其他情况下匹配字边界(位于\w和\W字符之间) \t 匹配制表符\u0009 \r 匹制回车符\u000D \v 匹配垂直制表符\u000B \f 匹配换页符\u000C \n 匹配换行符\u000A \e 匹配退出键(符)\u001B \040 匹配以八进制表示的ASCII字符(最多三位数);在没有前导零的情况下,如果只有一位数字或者相应数字与某个捕获组的编号对应,那就是反向引用(backreference)。字符\040表示一个空格。 \x20 匹配以十六进制表示的ASCII字符(两位数) \cC 匹配ASCII控制符,例如\cC匹配Ctrl+C \u0020 匹配以十六进制表示的Unicode字符 \ 反斜杠后面如果不是一个可转义的字符,则匹配该字符本身。例如,\就相当于\x2A 字符类 说明 . 匹配除\n之外的任意字符。 [aeiou] 匹配特定字符集中包含的任意一个字符 [^aeiou] 匹配特定字符集中不包含的任意一个字符 [0-9a-fA-F] 连字符(-)用来指定连续的字符范围 \p{name} 匹配由{name}指定的命名字符类中的任意字符 \P{name} 匹配不包含在{name}指定的组或块范围中的文本 \w 匹配英文数字字母字符,在指定兼容ECMAScript的情况下,等价于[a-zA-Z0-9] \W 匹配非英文数字字母字符,在指定兼容ECMAScript的情况下,等价于[^a-zA-Z0-9] \s 匹配任意空白字符,在指定兼容ECMAScript的情况下,等价于[\f\n\r\t\v] \S 匹配任意非空白字符,在指定兼容ECMAScript的情况下,等价于[^\f\n\r\t\v] \d 匹配数字字符,在指定兼容ECMAScript的情况下,等价于[0-9] \D 匹配非数字字符,在指定兼容ECMAScript的情况下,等价于[^0-9] MetacharactersDefined MChar Definition ^ Startofastring. $ Endofastring. . Anycharacter(except\nnewline) | Alternation. {...} Explicitquantifiernotation. [...] Explicitsetofcharacterstomatch. (...) Logicalgroupingofpartofanexpression. 0ormwww.hunanwang.netression. + 1ormoreofpreviousexpression. ? 0or1ofpreviousexpression;alsoforcesminimalmatchingwhenanexpressionmightmatchseveralstringswithinasearchstring. \ Precedingoneoftheabove,itmakesitaliteralinsteadofaspecialcharacter.Precedingaspecialmatchingcharacter,seebelow.

MetacharacterExamples Pattern SampleMatches ^abc abc,abcdefg,abc123,... abc$ abc,endsinabc,123abc,... a.c abc,aac,acc,adc,aec,... bill|ted ted,bill ab{2}c abbc a[bB]c abc,aBc (abc){2} abcabc abc ac,abc,abbc,abbbc,... ab+c abc,abbc,abbbc,... ab?c ac,abc a\sc ac

EscapedChar Description ordinarycharacters Charactersotherthan.$^{[(|)]}+?\matchthemselves. \a Matchesabell(alarm)\u0007. \b Matchesabackspace\u0008ifina[];otherwisematchesawordboundary(between\wand\Wcharacters). \t Matchesatab\u0009. \r Matchesacarriagereturn\u000D. \v Matchesaverticaltab\u000B. \f Matchesaformfeed\u000C. \n Matchesanewline\u000A. \e Matchesanescape\u001B. \040 MatchesanASCIIcharacterasoctal(uptothreedigits);numberswithnolwww.visa158.combackreferencesiftheyhaveonlyonedigitoriftheycorrespondtoacapturinggroupnumber.(Formoreinformation,seeBackreferences.)Forexample,thecharacter\040representsaspace. \x20 MatchesanASCIIcharacterusinghexadecimalrepresentation(exactlytwodigits). \cC MatchesanASCIIcontrolcharacter;forexample\cCiscontrol-C. \u0020 MatchesaUnicodecharacterusingahexadecimalrepresentation(exactlyfourdigits). \ Whenfollowedbyacharacterthatisnotrecognizedasanescapedcharacter,matchesthatcharacter.Forexample,\isthesameas\x2A.

CharClass Description . Matchesanycharacterexcept\n.IfmodifiedbytheSinglelineoption,aperiodcharactermatchesanycharacter.Formoreinformation,seeRegularExpressionOptions. [aeiou] Matchesanysinglecharacterincludedinthespecifiedsetofcharacters. [^aeiou] Matchesanysinglecharacternotinthespecifiedsetofcharacters. [0-9a-fA-F] Useofahyphen(–)allowsspecificationofcontiguouscharacterranges. \p{name} Matchesanycharacterinthenamedcharacterclassspecifiedby{name}.SupportednamesareUnicodegroupsandblockranges.Forexample,Ll,Nd,Z,IsGreek,IsBoxDrawing. \P{name} Matchestextnotincludedingroupsandblockrangesspecifiedin{name}. \w Matchesanywordcharacter.EquivalenttotheUnicodecharactercategories[\p{Ll}\p{Lu}\p{Lt}\p{Lo}\p{Nd}\p{Pc}].IfECMAScript-compliantbehaviorisspecifiedwiththeECMAScriptoption,\wisequivalentto[a-zA-Z_0-9]. \W Matchesanynonwordcharacter.EquivalenttotheUnicodecategories[^\p{Ll}\p{Lu}\p{Lt}\p{Lo}\p{Nd}\p{Pc}].IfECMAScript-compliantbehaviorisspecifiedwiththeECMAScriptoption,\Wisequivalentto[^a-zA-Z_0-9]. \s Matchesanywhite-spacecharacter.EquivalenttotheUnicodecharactercategories[\f\n\r\t\v\x85\p{Z}].IfECMAScript-compliantbehaviorisspecifiedwiththeECMAScriptoption,\sisequivalentto[\f\n\r\t\v]. \S Matchesanynon-white-spacecharacter.EquivalenttotheUnicodecharactercategories[^\f\n\r\t\v\x85\p{Z}].IfECMAScript-compliantbehaviorisspecifiedwiththeECMAScriptoption,\Sisequivalentto[^\f\n\r\t\v]. \d Matchesanydecimaldigit.Equivalentto\p{Nd}forUnicodeand[0-9]fornon-Unicode,ECMAScriptbehavior. \D Matchesanynondigit.Equivalentto\P{Nd}forUnicodeand[^0-9]fornon-Unicode,ECMAScriptbehavior.

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