Question

I want to match everything except a newline, space and tab. I know there is \S, but it says to not use it in char classes, so how can I say I want everything except \S? What I want to check is that the string I have has at least any visible char.

Test 1234      --> should be found
____ (spaces)  --> should not be found

Answer 1

\S is enough, which Matches anything BUT a whitespace.

preg_match('/\S/', $subject);