[PHP] eregi for alpha-numeric, punctuation & whitespace?

[Jas]

Not sure how to accomplish this, and not completely familiar with all 
the options available with regular expressions.

I need to sanitize input data by only allowing alpha-numeric characters, 
whitespace, punctuation (,.;:) and of course carrige returns.

here is what I have so far...
eregi("^[0-9a-zA-Z]{1,40}$",$_POST['input'])
Any help is appreciated, right now anything with a space, period, comma 
etc gets flagged.

Jas

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