Regular Expressions (REGEX): Basic symbols - Scripting Blog

Regular Expressions (REGEX): Basic symbols · Take special properties away from special characters: \. would be used to represent a literal dot ... Skiptomaincontent RegularExpressions(REGEX):BasicsymbolsKoryThacher July31st,20180 WelcomebacktotheRegExguide.LastpostwetalkedalittlebitaboutthebasicsofRegExanditsuses.Imentionedthemostimportantthingistounderstandthesymbols.Todaywe’lleaseinwithsomeofthebasicstogetusgoing,butlaterwewillexpandontheseandseesomeotheroptionswehave. . isusedtorepresentanysinglecharacter,asidefromanewline,soitwillfeelverysimilartothewindowswildcard? \ istheescapecharacterforRegEx,theescapecharacterhastwojobs: Takespecialpropertiesawayfromspecialcharacters:\. wouldbeusedtorepresentaliteraldotcharacter.\\ isusedforaliteralbackslashcharacter. Addspecialpropertiestoanormalcharacter:\d isusedtolookforanydigit(we’llseemoreoftheseinabit) Wecanuse{} tospecifyquantityinafewdifferentwaysbyattachingthemtocharactersorsymbols. {exactnumber} sosomethinglike\d{2} says“lookforexactlytwodigits” {min,max} sosomethinglike\d{2,4} says“lookforatleasttwodigits,butkeepgrabbingthemuntilyouhavemorethan4” {min,} willcheckforaminimumwithnomaxcap,so\d{2,}says“lookforatleast2digits,butkeepgrabbingthemuntilyouseesomethingthatisn’tadigit” + isashortcutfor{1,0} soyoucansay“oneormore” * isashortcutfor{0,} soyoucansay“zeroormore”(becarefulwiththatone!) ? is{0,1} soyoucansay“thismayormaynotbehere”.Couldbeusefulforlinksthatmayormaynothavean“s”for“http”/”https” Characterclasseslike\d aretherealmeat&potatoesforbuildingoutRegEx,andgettingsomeusefulpatterns.Thesearecasesensitive(lowercase),andwewilltalkabouttheuppercaseversioninanotherpost.Threeofthesearethemostcommontogetstarted: \d looksfordigits \s looksforwhitespace \w looksforwordcharacters Wewilltalkabout\p inafutureposttomatchmorespecificsymbolgroups. Letsputittogetherandtryacouplethings.We’llstilluse-match and$matches[0] fornow,butwe’llusesomeotherthingstoleverageRegExoncewearecomfortablewiththebasicsymbols. We’llusethesameshellaswehadinthelastpost andthesameMOCK_DATA asbefore.Thistime,letsmatchemails.Tryityourselffirst! Hint: TheemailsseemtoallbeFirstletterfollowedbylastname,sojustsomewordcharacter.Thenan@symbol,morewordcharacter,thenadot,thenmorewordcharacters! Answer: "\w+@\w+\.\w+" Puttingittogether: #grabourdata $file=get-content"$PSScriptRoot\MOCK_DATA.txt" #makeourpattern $regex="\w+@\w+\.\w+" #loopthrougheachline foreach($linein$file) { #ifourlinecontainsourpattern,writethematcheddatatothescreen if($line-match$regex) { $matches[0] } } Results: [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] Onceagain,youcanfinditongithere. Hopeyou’reenjoyingRegExsofar,andstartingtoseehowitcanbeprettyuseful!Nexttimewewilltakealookatgroupingtoextractdifferentpiecesofdata,andusing[regex]insteadofjust$matches. Asalways,don’tforgettorate,commentandshare!Letmeknowwhatyouthinkofthecontentandwhattopicsyou’dliketoseemeblogaboutinthefuture. KoryThacher PremierFieldEngineer Follow Readnext PowerShellPowerTip:HistoryofcommandswithPSReadline OneofthereallycoolthingsPSReadlineprovides(moduleshippingonv5+)isn'tasimmediatelyobviousasthesyntaxhighlighting.Itoffersapersistenthistorythatis... KoryThacherAugust7,2018 0comment RegularExpressions(REGEX):Grouping&[RegEx] WelcomebacktotheRegExcrashcourse.Lasttimewetalkedaboutthebasicsymbolsweplantouseasourfoundation.Thisweek,wewillbelearninganewwaytoleverage... KoryThacherAugust14,2018 1comment 0comments Commentsareclosed. 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