javascript - Regex to match multiple patterns in any order -

i'm validating password complexity in asp.net mvc3 app. current requirements must contain @ least 1 upper case letter, 1 lower case letter, 1 digit , no more 3 repeated characters. i'd generalise numbers though, , add condition non-alphanumeric characters.

at present, i'm validating server-side only, i'm able call regex.ismatch multiple times using 1 regex each condition. want able validate client-side though. because unobtrusive jquery validation allow 1 regex, need combine 5 conditions single pattern.

i don't know when comes regular expressions i've been doing bit of reading recently. may missing simple can't find way , multiple patterns way | or them.

you can (in .net) several lookahead assertions in single regex:

^(?=.*\p{lu})(?:.*\p{ll})(?=.*\d)(?=.*\w)(?!.*(.).*\1.*\1) 

will match if conditions true.

^                  # match start of string (?=.*\p{lu})       # true if there @ least 1 uppercase letter ahead (?=.*\p{ll})       # true if there @ least 1 lowercase letter ahead (?=.*\d)           # true if there @ least 1 digit ahead (?=.*\w)           # true if there @ least 1 non-alnum character ahead (?!.*(.).*\1.*\1)  # true if there no character repeated twice ahead 

note match not going consume characters of string - if want match operation return string you're matching against, add .* @ end of regex.

in javascript, can't use unicode character properties. instead use

^(?=.*[a-z])(?:.*[a-z])(?=.*\d)(?=.*\w)(?!.*(.).*\1.*\1) 

which of course use ascii letters validation. if that's ok you, fine. go , augment character classes [a-zÄÖÜÀÈÌÒÙÁÉÍÓÚ] etc. etc. never complete this. on server side, if want validation yield same result, you'd have specify regexoptions.ecmascript .net regex engine behaves javascript engine (thanks alan moore noticing!).