What does [\S\s]* mean in regex in PHP?

Question

What is meant by [\\s\\S]* in regex in PHP? Does [\\s\\S]* actually match every string the same as .*?

Answer 1

By default . doesn't match new lines - [\s\S] is a hack around that problem.
This is common in JavaScript, but in PHP you can use the /s flag to to make the dot match all characters.