教程pythonhowto-regex

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1、RegularExpressionHOWTORelease2.6.5GuidovanRossumFredL.Drake,Jr.,editorApril25,2010PythonSoftwareFoundationEmail:docs@python.orgContents1Introductionii2SimplePatternsii2.1MatchingCharacters.........................................ii2.2RepeatingThings......................

2、.....................iii3UsingRegularExpressionsiv3.1CompilingRegularExpressions...................................iv3.2TheBackslashPlague.........................................v3.3PerformingMatches..........................................v3.4Module-LevelFunctions....

3、...................................vii3.5CompilationFlags...........................................vii4MorePatternPowerix4.1MoreMetacharacters.........................................ix4.2Grouping...............................................x4.3Non-capturingandNamedGr

4、oups..................................xi4.4LookaheadAssertions.........................................xiii5ModifyingStringsxiv5.1SplittingStrings............................................xiv5.2SearchandReplace..........................................xiv6CommonProblem

5、sxvi6.1UseStringMethods..........................................xvi6.2match()versussearch()........................................xvi6.3GreedyversusNon-Greedy......................................xvii6.4NotUsingre.VERBOSE.......................................xvii7Feed

6、backxviiiAuthorA.M.KuchlingRelease0.05AbstractThisdocumentisanintroductorytutorialtousingregularexpressionsinPythonwiththeremodule.ItprovidesagentlerintroductionthanthecorrespondingsectionintheLibraryReference.1IntroductionTheremodulewasaddedinPython1.5,andpr

7、ovidesPerl-styleregularexpressionpatterns.EarlierversionsofPythoncamewiththeregexmodule,whichprovidedEmacs-stylepatterns.TheregexmodulewasremovedcompletelyinPython2.5.Regularexpressions(calledREs,orregexes,orregexpatterns)areessentiallyatiny,highlyspecializedprogram-ming

8、languageembeddedinsidePythonandmadeavailablethroughtheremodule.Usingthislittlelanguage,youspecifytherul