regular expression与java

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1、RegularExpression與Java蕭宇程swanky.hsiao@gmail.comhttp://swanky.adsldns.org/IntroductiontoRegularExpressionsRegularExpressionSyntaxObjectModelsUsingregexesinJavaPart1：IntroductiontoRegularExpressionsRegularexpressionsarethekeytopowerful,flexible,andefficienttext

2、processing.SearchingTextFiles：egrepTheFilenameAnalogyInDOS/Windowsdir*.txt*、?：fileglobsorwildcards*：matchanything?：matchanyonecharacterGeneralizedPatternLanguageRegularExperssions：Powerfulpatternlanguage(generalizedpatternlanguage)andthepatternsthemselvesTheL

3、anguageAnalogyRegularExpressionsarecomposedof：Metacharacters(specialcharacters)Literal(normaltextcharacters)Literaltextactingasthewordsandmetacharactersasthegrammar.Part2RegularExpressionSyntaxRegularExpression測試小程式http://www.javaworld.com.tw/blog/archives/c

4、iyawasay/000381.htmlRegularExperssion的投影片與範例檔http://www.javaworld.com.tw/blog/archives/ciyawasay/000394.htmlStartandEndoftheLineStart：^(caret)End：$(dollar)cat、^cat、cat$Matchapositioninthelineratherthananyactualtextcharactersthemselves.Question：^cat$、^$、^各代表什麼

5、意思?CharacterClassesMatchinganyoneofseveralcharacters[…]Negatedcharacterclasses[^…]Matchinganyoneofseveralcharacters[…]grey、gray⇒gr[ea]y[0-9]character-classmetacharacter‘-’(dash)⇒[0-9a-fA-F]=[A-Fa-f0-9]Adashisametacharacteronlywithinacharact

6、erclass–otherwiseitmatchesthenormaldashcharacter.Negatedcharacterclasses[^…]Matchesanycharacterthatisn’tlisted.[^1-6]matchesacharacterthat’snot1through6.Question：Whydoesn’tq[^u]match‘Qantas’or‘Iraq’CharacterClassNotesAcharacterclass,evennegated,stillrequiresa

7、charactertomatch.Considercharacterclassesastheirownminilanguage.Therulesregardingwhichmetacharactersaresupported(andwhattheydo)arecompletelydifferentinsideandoutsideofcharacterclasses.MatchingAnyCharacterwithDot.(dot、point)Matchesanycharacter03.19.76⇒03a19●76

8、03/19/76、03-19-76、03.19.76⇒03[-./]19[-./]76Thedotsarenotmetacharacterswithinacharacterclass[.-/]wouldbeamistakeAlternationMatchinganyoneofseveralsubexperssions

9、(or、bar)Combinemultipleexpe