PHP Regex Any Character

Question

The . character in a php regex accepts all characters, except a newline. What can I use to accept ALL characters, including newlines?

Answer 1

An important thing is missing here. [\s\S] matches one character, whereas a newline can be a character sequence. (Windows uses two characters: \r\n.) Neither . (with DOT_ALL modifier) nor [\s\S] will match the newline sequence. Best way to match any character or any newline is (.|\R), "everything except a newline or a newline". \R matches \n, \r and \r\n.