PHP remove all non UTF-8 characters from string

Question

I need to remove symbols like ",./! and so on from the beginning and the end of the string. but still need to leave numbers and characters like ąčęėįšųž and many more from UTF-8. for example:

the result of string &g&g should be g&g;
the result of string ąčęėį should be ąčęėį;
the result of string "name" should be name;
the result of string 69 should be 69
the result of string --abc--- should be abc

I believe it should be done using preg_replace but can't find how.

[In this post, indicates how solve your problem][1] [1]: stackoverflow.com/questions/1401317/… — Alberto Delgado Roda
– Alberto Delgado Roda, Commented Nov 30, 2014 at 19:18

Toto · Accepted Answer · 2014-12-02 19:17:03Z

3

If I understand well, this will do what you want:

$result = preg_replace('/(?:^[^\p{L}\p{N}]+|[^\p{L}\p{N}]+$)/u', '', $input);

Where

\p{L} stands for any character that is a letter (unicode)
\p{N} stands for any character that is a digit (unicode)
[^\p{L}\p{N}] is a negative character class that matches characters that is not letter or digit.

edited Dec 2, 2014 at 19:17

answered Dec 1, 2014 at 8:14

Toto

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1 Comment

Einius Over a year ago

well exactly this code removes all characters. because \P{L} removes all non letter characters and \P{N} all non numbers there is nothing left.

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