java字符串分析正则表达式,js正则表达式匹配数字和字母

iamtryingtocheckwhetherapasswordisalphanumericornotusingregex

butiamnotgettingtheresultiexpect.whatistheproblemwiththebelowcode？

booleanpasswordonlyalphanumericcheck=false；

patternpatternalphanumericcheck=pattern.com pile (' pgddlca-za-z0-9 ) $ ' )；

matchermatcheralphanumericcheck=patternalphanumericcheck.matcher (log in.get password () )；

if (matcheralphanumericcheck.find ()

passwordonlyalphanumericcheck=true；

Thanks for help

youneedtoaddaquantifierthatsuitsyourrequirements : *-0 ormoreoccurrencesor-1 ormoreoccurrences.youcanalsoomitthe ^ and

booleanpasswordonlyalphanumericcheck=false；

if(login.getpassword ().matches([a-za-Z0-9]* ) )

passwordonlyalphanumericcheck=true；

To match all Unicode letters，usep{l}class(andperhaps，p{M} to match diacritics ) 3360((p{l}p )

whatisthedifferencebetweenlogin.get password ().Matches ) ' [0-9a-za-z]* '； and login.getPassword ().matches([0-9a-za-z] )；

the.Matches([0-9a-za-z] ) willonlyreturntrueifthewholestringcontainsjust1digitor letter.the * in (0- 9a-zing