php multi byte strings regex

Question

We have a regex to strip out non alpha numeric characters except for '#', '&' and '-'. Here is what it looks like:

preg_replace('/[^a-zA-Z0-9#&-*]/', '', strtolower($title));

Now we need to support traditional Chinese strings and the above function won't work. How can I implement similar functionality for traditional Chinese.

Thanks,

So which Chinese characters are "alpha numeric"?

NullUserException
– NullUserException

2011-08-12 19:50:20 +00:00
Commented Aug 12, 2011 at 19:50 — NullUserException
– NullUserException, Commented Aug 12, 2011 at 19:50

Karolis · Accepted Answer · 2011-08-12 19:52:00Z

3

Use u modifier:

preg_replace(`/[^a-zA-Z0-9#&-*诶]/u`, '', $string);

By the way, don't use strtolower(), because it will break your string. Use mb_strtolower():

mb_strtolower($string, 'UTF-8');

answered Aug 12, 2011 at 19:52

Karolis

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Comments

johangu · Accepted Answer · 2011-08-12 19:49:46Z

0

Have you tried mb_ereg_replace() instead of preg_replace()? That might do the trick.

http://www.php.net/manual/en/function.mb-ereg-replace.php

answered Aug 12, 2011 at 19:49

johangu

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2 Comments

Marc B Over a year ago

ereg should be avoided in general, even if this particular one's in the mb_ section and not marked as deprecated. preg's the standard regex interface in PHP now, and ereg itself will vanish some day.

johangu Over a year ago

There is no preg_replace in the mb_-section though, which is why I suggested the ereg from there.

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