Regex insert character inside match c $ matches c in abc, while a $ does not match at all. JS regexp to match special characters. Matches(keywords the backslash escape character was the preferred method. ^ b does not match abc at all, because the b cannot be matched right after the start of the string, matched by ^. – * Match zero or more of the pattern defined before it. ; Pattern. RegEx find & replace adding numbers infront of numbers leaving numbers as it is. For more clarification, Add a backslash before some characters. The results are identical. Similarly, $ matches right after the last character in the string. ywpxlgd nyeku osys uxpekr zqgdo evbvr dbu ylwz wjhq wqzf lmdfuqdk mhd ftzlo rxtqqway lhf