PHP Preg-Replace more than one underscore

Question

How do I, using preg_replace, replace more than one underscore with just one underscore?

Answer 1

preg_replace()

the + operator is needed

$text = "______";
$text = preg_replace('/[_]+/','_',$text);

Answer 2

You can also use T-Regx library which has automatic delimiters.

pattern('_+')->replace($your_string)->with('_');

Answer 3

Actually using /__+/ or /_{2,}/ would be better than /_+/ since a single underscore does not need to be replaced. This will improve the speed of the preg variant.

Answer 4

preg_replace('/[_]+/', '_', $your_string);

Answer 5

I'm don't the reasons you want to use preg_replace but what's wrong with:

str_replace('__', '_', $string);

Answer 6

This will Accept Only Characters,numeric value or Special Character found it will replace with _
<?php
error_reporting(0);
if($_REQUEST)
{
    PRINT_R("<PRE>");
    PRINT_R($_REQUEST);
    $str=$_REQUEST[str];
    $str=preg_replace('/[^A-Za-z\-]/', '_', $str);
    echo strtolower(preg_replace('/_{2,}/','_',$str));
}
?>
<form action="" method="post">
<input type="text" name="str"/>
<input type="submit" value="submit"/>
</form>