I\'m trying to find a text change regularly inside javascript tag :
You can do it with regular expression:
preg_match ($pattern, $java_script, $matches);
Pattern depends, if the variable 'wmsAuthSign' is unique. For example:
$pattern = '/wmsAuthSign=(.*?)==/';
preg_match ($pattern, $java_script, $matches);
echo $matches[1];
But you can always start your pattern from 'streamer' for example if 'wmsAuthSign' is not unique.