Regex for custom verification of string

Question

I need to make a regex pattern to check if whole input string is made out of characters a-z, A-Z, 0-9 without spaces in the middle. I tried using ^[ ]*[a-zA-Z0-9][ ]*$ to find but it doesn't work for some reason.

For example, " dnsjkfs32NJ" is a valid string but "fds fsdfs" is not.

Thanks. :)

Where are you using this regex? Perl? PHP? Ruby? grep? C#?

regulatethis
– regulatethis

2012-12-28 19:11:28 +00:00
Commented Dec 28, 2012 at 19:11 — regulatethis
– regulatethis, Commented Dec 28, 2012 at 19:11

Wiseguy · Accepted Answer · 2012-12-28 19:11:56Z

5

This might work for you

^\s*[a-zA-Z0-9]+\s*$

You're missing a + after your character class; without it, it's matching one and only one character.

edited Dec 28, 2012 at 19:11

Wiseguy

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answered Dec 28, 2012 at 19:09

alan

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2 Comments

Barmar Over a year ago

\s is any whitespace: space, tab, etc.

FrankieTheKneeMan Over a year ago

personally, I'd use a trim function, instead of whitespace matching. Personal preference, but I find I often need to trim the string anyway.

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