I did a search but I didn't found anything . I'm looking for a pattern that will search in an alpha-numeric string (with the exact length of 7) the letter "P" . This is what I came up with until now , why isn't working ?
$pattern = "/^[\wP]{7}$/";
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Can you give some positive and negative hits?Niels Bom– Niels Bom2010-08-09 11:09:07 +00:00Commented Aug 9, 2010 at 11:09
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Thanks guys , I eventually switched to strlen and strposandrei– andrei2010-08-09 23:24:08 +00:00Commented Aug 9, 2010 at 23:24
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4 Answers
Well it isn't working because [\wP]{7} (in your regex: /^[\wP]{7}$?/) means find 7 characters that are either a word character OR the letter P. It could find all Ps and it would match, or all word characters and it would match. My quick fix would be to verify the string is 7 letters long using a regex then do a string position to find the "P":
if(preg_match("/^[\w]{7}$/", $target) && strpos($target, "P") != -1) {
// Do stuff
}
Comments
Try this:
$pattern = '/^([a-zA-Z0-9]{6})(P{1})$/';
You could condider using strpos and strlen for speed!
1 Comment
Bob Fincheimer
This pattern will only match a P at the end.
\w contains a-z, A-Z, 0-9 and _ so it is not what you want at all.
I'll try with:
if ( preg_match("/^[a-z0-9]*P[a-z0-9]*$/i", $target) && ( strlen($target) == 7 ) ) { ... }
Comments
This should match any string that is 7 characters long and contains an uppercase P:
(?=^\w{7}$)\w*P\w*
