PHP preg_replace for multi language

Question

I have input search use preg_replace, however I wish my search input accept others language

Keep - Chinese, Japaneses, German.. etc.

Remove - symbol character like @#$%^*() those

This one only keep english preg_replace("/[^a-zA-Z0-9]+/", "", $search);

any way to set up for multi language?

So, what *do* you want to keep and what do you want to remove? May it be easier to use a blacklist rather than a whitelist? — deceze, Jun 12 '13 at 07:38
To regex/php, `æ` is as much of a unicode character as `^`. Your best bet it to make a blacklist, and simply replace with that. (`preg_replace("/[!\"#¤%&=/]+", "", $search);`). — h2ooooooo, Jun 12 '13 at 07:39

Joop Eggen · Answer 1 · 2013-06-12T07:53:05.343

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Though for java, a concise overview here.

You can use the so called Posix notation:

[^\p{Alnum}\p{M}]

The first is the alphanumeric group, and the second the combining diacritical marks: the accents. The latter should not be forgotten because one can write ĉ as one Unicode point c-circumflex, but also as 'c' followed by a combining circumflex ^ (zero width, here represented by the normal circumflex). In some languages there are more than one marks to a base letter.

Correction:

[^\p{L}\p{N}\p{M}]

edited Jun 12 '13 at 07:53

answered Jun 12 '13 at 07:46

Joop Eggen

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The php reference for the same: http://www.php.net/manual/en/regexp.reference.unicode.php – Denis de Bernardy Jun 12 '13 at 07:48
What to do for this if i need to do @Hello I want this for use mention feature – Sandip Jha Apr 14 '20 at 12:04
@SandipJha I am unsure what you want. As also this question is closed, just ask a question yourself. – Joop Eggen Apr 14 '20 at 12:11

AbsoluteƵERØ · Accepted Answer · 2013-06-12T08:11:33.517

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Here's the PHP unicode regex reference. The plus + isn't necessary as PHP will loop through the string. The \s will match all whitespace characters.

preg_replace("![^\p{L}\p{N}\s]!", "", $search);

If you want to match only the space character itself you would add it in the brackets as a literal:

preg_replace("![^\p{L}\p{N} ]!", "", $search);

Update Added bit about spaces per comment request

edited Jun 12 '13 at 08:11

answered Jun 12 '13 at 07:49

AbsoluteƵERØ

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how to keep space? " " – user2178521 Jun 12 '13 at 08:00
I've added the whitespace character match `\s`. – AbsoluteƵERØ Jun 12 '13 at 08:12
one more question, when I out put, it become symbol – user2178521 Jun 12 '13 at 08:27
That has to do with the encodings. http://stackoverflow.com/questions/1696619/displaying-unicode-symbols-in-html – AbsoluteƵERØ Jun 12 '13 at 15:09

PHP preg_replace for multi language

2 Answers2