Range out of order in character class

Question

I\'m getting this odd error in the preg_match() function:

Warning: preg_match(): Compilation failed: range out of order in character class at offset 54

The l

Answer 1

While the other answers are correct, I'm surprised to see that no-one has suggested escaping the variable with preg_quote() before using it in a regex. So if you're looking to match an actual bracket or anything else that means something in regex, that'll be converted to a literal token:

$escaped = preg_quote($gsmNumber);
preg_match( '/(.*)/s', $fileData, $matches);