Detect non-empty string with regexp?
pcre, php, regex
Solution
/[\s\S]/
matches any character, even if you can't use the `/s` modifier.
You don't need a quantifier (`+`) because if one character matches, then the condition is already fulfilled.
Problem
How do I write a PHP regexp which detects that a string is not empty? Empty means, in this case 0 characters. A single space, or a single newline counts as not empty, for instance. (It has to be regexp suitable for preg_match(), since I have a lookup table with various regexps and don't want to handle this case in any special way, it would complicate the code to not use a regexp here.) I also can not use any regex modifiers such as "s" outside the `//` for sad reasons.