douwu0882 2014-10-14 21:45
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preg_replace转义<? 和?>

I want to remove the first occurrence of <? and the last occurrence of ?> from a string using preg_replace, but no matter how I attempt to escape them, they always cause trouble.

PHP Code

$string = preg_replace('/<?/', '', $string);
$string = preg_replace('/?>/', '', $string);

What shall I write into the expression area?

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  • dpp80346 2014-10-14 21:53
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    You can use:

    $string = preg_replace('/^((?:(?!<\?).)*)<\?|\?>(?!.*?\?>)/s', '$1', $string);
    

    RegEx Demo

    Or quite simply:

    $string = preg_replace('/<\?(.*)\?>/s', '$1', $string);
    

    PS: Note that you can do this without using regex also. Use strpos and strrpos functions in PHP to get first position of <? and last position of ?> and then use substr function.

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