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1、MasteringRegularExpressions,1stEdition,byJefferyFriedlIsawmyfirstexampleofthiswhenIdownloadeditthreeorfouryearsago.Ijustglancedatitandnoticedthatitwaschoppedup,inthateachpagewassplitintotwopages—itspannedtwoPDFpages.Soa340–350pagebookwoundupbeing750PDFpages.Youcouldn'tnavigatefromapagereferencetoa
2、notherpage,becausethepagenumbersobviouslydidn'tcoincide.AtthetimeIdidn'tgiveitmuchmorethought,asIdidn'tdotomuchwithregexanyway.FromtimetotimeIwouldseeanotherpost,soIwoulddownloaditandithasalwaysbeenthesameoldversion.AshortwhilebackIdidrunacrossaneedtoknowregexalittlebettersoIgotouttheversionthatIh
3、adandstartedtomakesomesenseoutofit.ThebookappearedtobejustwhatIneededbutwasjusthardtocomprehendthewayitwaschoppedup.Formyownuse,Ire-didthebooktotheextent,thateachbookpageisnowononePDFpage.Itwasnecessarytomakethepageslegalsize(8.5x14)todothisandmaintainatypefacelargeenoughtobeeasilyvisible.TheTable
4、ofContentsatthebeginningofthebookhasbeenomittedhereasIhaveincludedaTableofContentsinthisPDFdocument.TheIndexatthebackofthebookremainsasitwas,duetothefactthattherewasnoeasywaytore-doitwithoutamajortimeinvestment.Atleastnowthough,apagereferenceintheindexcanbenavigatedtousingtheAcrobatpagenavigationt
5、ools.Iamuploadingthisforotherstouseandhopethatitmightbehelpful.Feelfreetodeletethispage,butshouldyou,atalaterdatedecidetouploadityourself,pleaseindicatethatitisamodifiedversion,fromtheonethathasbeenaroundforyears.Page11IntroductiontoRegularExpressionsInthischapter:SolvingRealProblemsRegularExpress
6、ionsasaLanguageTheRegular-ExpressionFrameofMindEgrepMetacharactersExpandingtheFoundationPersonalGlimpsesHere'sthescenario:yourbossinthedocumentationdepartmentwantsatooltocheckfordoubledwords(suchas''thisthis"),acommonproblemwithdocumentssubjecttoheavyediting.Yourjobistocreateasolutionthatwill:Acce
7、ptanynumberoffilestocheck,reporteachlineofeachfilethathasdoubledwords,highlight(usingstandardANSIescapesequences)eachdoubledword,andensurethatthesourcefilenameappearswitheachlineinthereport.Workacrosslines,evenfi
