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Old 12-02-2005, 01:55 AM
mylinear mylinear is offline
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Join Date: Jul 2005
Posts: 77

PHP: String validation

How do I validate whether a string meets the following criteria.
1. Must be 6 to 12 characters in length
2. Must consists of only a to z with no spaces etc

I was using:
$string = "abcdef";
$pattern = "/[a-z]{6,12}/";
preg_match($pattern, $sring);
// returns true

But I found that it would also return true with other strings such as:
$string = " abcdef xyz";

Do I need to include the 3rd array parameter in preg_match and use the resulting array element to do further checking on the match? Or should I not be using preg_match to do this sort of validation?

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Old 12-02-2005, 02:51 AM
mylinear mylinear is offline
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Join Date: Jul 2005
Posts: 77
Upon further testing, this appears to work.

$pattern = "/^[a-z]{6,12}$/";

But I'm still not sure whether it is the correct way to do this.

Old 12-02-2005, 08:37 AM
LH Brandon LH Brandon is offline
Web Hosting Master
Join Date: Jan 2005
Location: Olean, NY
Posts: 1,353
Yes, you need to include the ^ and $; otherwise, as long as 6 consecutive letters in the string match the pattern, it's happy, even if other characters do not match. The ^ tells it, though, that the pattern must be first in the string, and $ tells it that the pattern must also be last.

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Old 12-03-2005, 08:02 AM
mylinear mylinear is offline
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Join Date: Jul 2005
Posts: 77
Thanks to Hostultrix-Brandon for the pointer.

I came across some tutorials and examples on the following site that others may find helpful.


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