Javascript String Character Checking -


what best way check javascript string @ least 4 characters long, contains @ least 1 lowercase letter, 1 uppercase letter , digit?

testing lowercase letters has been covered elsewhere:

function haslowercase(str) {     return (/[a-z]/.test(str)); }

it's trivial modify implement hasuppercase , hasdigits.

once have written these functions, can check that:

if( haslowercase(passwd) && hasuppercase(passwd) && hasdigits(passwd) ) {     // valid password! }

if use in many places, consider making new function:

function ispasswordvalid(str) {     return haslowercase(passwd) && hasuppercase(passwd) && hasdigits(passwd); }

which can further use like:

if( ispasswordvalid("passwd") ) {     // ... }

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