regex - preg_replace HTML code in PHP -

i want remove string below html code <span style="font-size: 0.8px; letter-spacing: -0.8px; color: #ecf6f6">3</span>

so came regex.

$pattern = "/<span style=\"font-size: \\d(\\.\\d)?px; letter-spacing: -\\d(\\.\\d)?px; color: #\\w{6}\">\\w\\w?</span>/um";

however, regex doesn’t work. can point me did wrong. i'm new php.

when tested simple regex, works problem remains regex.

  $str = $_post["txtarea"];   $pattern = $_post["regex"];   echo preg_replace($pattern, "", $str);

as advocate domdocument job here, still need regular expression down line, ...

the expression px numeric value can [\d.-]+, since you're not trying validate anything.

the contents of span can simplified [^<]* (i.e. opening bracket):

$re = '/<span style="font-size: [\d.-]+px; letter-spacing: [\d.-]+px; color: #[0-9a-f]{3,6}">[^<]*<\/span>/';  echo preg_replace($re, '', $str);

Kiastu