phpregexpreg-replace

Replace Javascript concatenation expression in a string with <em> tag

this is my first question here. I need to do what I guess is a simple php preg_replace() replacement but I have no knowledge about regular expressions.

I have an html formated text string, breaked by several " + figure("br") + " (including both begin and end quotes). I need to change them to <em class="br"></em> where 'br' is the argument I must preserve.

I have about 200+ text to replace. Of course I could replace the pre and post separately, but want to do it in the right way. Thanks in advance and forgive my English.

Sample input: <p>Bien!</p> <p>Gana <b>Material</b> por el <b>Doble Ataque</b> al " + figure("bn") + "c6 y a la " + figure("br") + "h8.</p>

Sample output: <p>Bien!</p><p>Gana <b>Material</b> por el <b>Doble Ataque</b> al <em class="bn"></em>c6 y a la <em class="br"></em>h8.</p>

[Edited for including the real data]

Solution

  • If you have a variable pre and post string (or one with meta characters as in your case), then I think it's best to use some regex escaping there:

    //  " + figure("br") + "
$pre = '" + figure';
$post = ' + "';

// escape
$pre = preg_quote($pre, "#");
$post = preg_quote($post, "#");

// then the regex becomes easy
$string = preg_replace(
               "#$pre\(\"(\w+)\"\)$post#",
               '<em class="$1"></em>',
               $string
);

    I assume you are converting some source code?