PHP regular expression to match lines starting with a special character

Question

I have a text file with some configuration value. There a comment starts with a # I am trying to find a regular expression pattern that will find out all the lines that star

Answer 1

You can simply write:

preg_match_all('~^#.*~m', $text, $m);

since the quantifier is greedy by default and the dot doesn't match newlines by default, you will obtain what you want.