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Expression to remove two identical characters and other end characters

I have a php reg expression that removes any special character from any string and replaces the character with a hyphen. The problem is, if there are two special characters following each other, I get two hyphens. for example, if I type test@hhh%^

, I get test-hhh--

, or if I type test@hhh%^kkk

, I get test-hhh--kkk

. I want my expression to give me test-hhh

. I want to remove two identical hyphens following each other plus any trailing hyphens in the string. My code is here

$slug = preg_replace('/[^a-zA-Z0-9]/', '-', $slug);
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2 answers


First apply this regex to your string:

$slug = preg_replace('#-{2,}#', '-', $slug);


Second, you are right-trimming (or regular) with a hyphen as an extra argument.

$slug = trim($slug, '-');
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You can find some useful information here http://www.regular-expressions.info/repeat.html , basically you need to specify the repetition modifier.



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