[SOLVED] replacing symbols help

[xnowandtheworldx]

I'm making a script, and I need to replace every symbol, like, `, ~, , , !, @, ETC. ETC. but instead of just replacing everyone if there are two in a row i still need it to only replace the symbols with only 1 "_"...and also remove any "_" that would be at the end after being replaced...heres an example...

 

The.losers! => the_losers

The..losers!! => the_losers

php!!rules:D => php_rules_D

 

so any help would be nice..i didn't really know how to explain lol.

[darkfreaks]

use preg_replace.

 

<?php

$pattern="`~!@";
$replace="";
preg_replace($pattern,$replace,$string);?>

[xnowandtheworldx]

Thank you very much! Never really understood preg_replace , but thanks again!

[darkfreaks]

if this is solved please hit topic solved

[xnowandtheworldx]

Eh,

 

Warning: preg_replace() [function.preg-replace]: No ending delimiter '`' found in /home/a5206629/public_html/bruce/test_r.php on line 5

 

$pattern="`~!@";
$replace = "the..losers..!~";
preg_replace($pattern,$replace,$string);

echo $string;

 

the line with the error is the preg_replace(); line

[effigy]

What do you want to allow rather than exclude? Every PREG pattern requires delimiters.

[xnowandtheworldx]

basically, i need to allow all numbers and letters, but all symbols need to be replaced with an underscore

[effigy]

Only ASCII letters?

 

preg_replace('/[^a-z\d]+/i', '_', $string);

[discomatt]

Here's my shot at it.

 

<?php

$regex = '/[\W_]++/'; // Match one or more characters that is a non-word character or underscore as many times as possible
$subject = 'Hello, my name\'s Matt! I _hate_ non-word..characters';

$result = preg_replace($regex, '_', $subject);

echo $result;

// Outputs:
//	Hello_my_name_s_Matt_I_hate_non_word_characters

?>

 

If you want to maintain underscores (ie __ not converted to _) just change the regex to this

 

$regex = '/[\W]++/';

[aCa]

A small coment.

I agree that the pattern /[\W]+/ is the best to use.

But we need one more regex. You stated you didn't wan't _ at the end of words.

You will need to do a replace with a pattern like this: /_(\s)|_$/

That will remove _ when space or end of line after it.

[effigy]

/_(\s)|_$/

 

This is better written as /_(?:\s|$)/ since they share the underscore and there's no need to capture.

[xnowandtheworldx]

Alright thanks for all the replies guys, and sorry about not replying till now, got caught up doing something and ended up forgetting about this thread >.< lol. Thanks again guys really helped!