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How to rewrite ereg to preg_match

Posted on 2013-01-01
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Last Modified: 2013-01-01
Hi,
I'm trying to figure out how to change the below code so it doesn't use ereg as I'm getting a deprecated error and I believe I should be using preg_match. I simply dropped in preg_match and not surprisingly, it failed with this error:
Warning: preg_match(): No ending delimiter '^'

What I'm trying to accomplish it to tell if the '$fromcaller' variable is an ip number or not and if so, 'do this' or else 'do that'. If there is a better/cleaner way of doing it, I'm all ears.

This is the snippet I'm using:
if (ereg("^([0-9]{1,3})x2E([0-9]{1,3})x2E([0-9]{1,3})x2E([0-9]{1,3})$", $fromcaller, $digit)) {
if (($digit[1] <= 255) && ($digit[2] <= 255) && ($digit[3] <= 255) && ($digit[4] <= 255)) {

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Question by:tjyoung
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Ray Paseur earned 500 total points
ID: 38734452
Preg expressions need a "regex delimiter" and it's often as simple as adding the delimiter.

$rgx 
= '#'  // DELIMITER
. "^([0-9]{1,3})x2E([0-9]{1,3})x2E([0-9]{1,3})x2E([0-9]{1,3})$"
. '#' // DELIMITER
;

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Try this and see... ~Ray
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Author Closing Comment

by:tjyoung
ID: 38734568
Thanks that was it!
Have a great 2013 Ray.
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LVL 110

Expert Comment

by:Ray Paseur
ID: 38734570
Thanks for the points, and a great New Year to you, too!

If you find that you have eregi() in your code, that is the case-insensitive version of the regular expression.  In that case, you can add the letter i after the last regex delimiter and the preg engine will become case-insensitive.
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