JAVA Regular Expression Errors

Posted by Berkay on Stack Overflow See other posts from Stack Overflow or by Berkay
Published on 2010-04-01T16:16:11Z Indexed on 2010/04/01 16:23 UTC
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java

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regex

I'm working on a simply password strength checker and i can not success applying regular expressions. In different resources different kinds of regular expressions are defined. i also find javascript regular expressions but had some problems to adapt.

First, these are the regular expressions i need for JAVA:

at least one lower case letter
at least one upper case letter at least
one number at least three numbers at
least one special character at least
two special characters both letters
and numbers both upper and lower case
letters, numbers, and special characters

My goal is not being a regular expression expert i just want to use the parts i need.If you direct me good tutorials which discusses above for java, will be appreciated.

Second, in this link some of them are mentioned but i'm getting problems to apply them.

here does not catch the lower case letter (my pass: A5677a)

if (passwd.matches("(?=.*[a-z])")) // [verified] at least one lower case letter {Score = Score+5;}

Also here i'm getting error : illegal escape character.

if (passwd.matches("(?=.*\d)")) // [verified] at least one number

Finally, are these expressions all different in different kind of programming or script languages?

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