JavaScript regular expressions to validate string

Posted by Activist on Stack Overflow See other posts from Stack Overflow or by Activist
Published on 2010-05-19T19:27:06Z Indexed on 2010/05/19 19:30 UTC
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JavaScript

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regex

I'm not that good with regular expressions...

I need a JavaScript regular expression that will do the following:

The string can contain letters (upper and lower case), but not punctuations such as éàïç...
The string can contain numbers (0..9) anywhere in the string, except on the first position.
The string can contain underscores (_).

Valid strings:

foo
foo1
foo_bar
fooBar

Invalid strings:

1foo --> number as first character
foo bar --> space
föo --> punctuation ö

Many thanks!

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