I have string which contain space in its html tags

$mystr = "＆lt; h3＆gt; hello mom ？＆lt; / h3＆gt;"

so i wrote regex expression for it to detect the spaces in it

$pattern = '/(?<=&lt;)\s\w |\s\/\s\w |\s\/(?=&gt;)/mi';

so next i want to modify the matches by removing space from it and replace it, so any idea how it can be done? so that i can fix my string like "＆lt;h3＆gt; hello mom ？＆lt;/h3＆gt;"

i know there is php function pre_replace but not sure how i can modify the matches

$result = preg_replace( $pattern, $replace , $mystr );

CodePudding user response：

You could keep it simple and do:

$output = str_replace(['＆lt; / ', '＆lt; ', '＆gt; '],
                      ['＆lt;/',   '＆lt;',  '＆gt;'], $input);

CodePudding user response：

For the specific tags like you showed, you can use

preg_replace_callback('/＆lt;(?:\s*\/)?\s*\w \s*＆gt;/ui', function($m) { 
    return preg_replace('/\s /u', '', $m[0]); 
}, $mystr)

The regex - note the u flag to deal with Unicode chars in the string - matches

• ＆lt; - a literal string
• (?:\s*\/)? - an optional sequence of zero or more whitespaces and a / char
• \s* - zero or more whitespaces
• \w - one or more word chars
• \s* - zero or more whitespaces
• ＆gt; - a literal string.

The preg_replace('/\s /u', '', $m[0]) line in the anonymous callback function removes all chunks of whitespaces (even those non-breaking spaces).