Test and debug regular expressions in real-time — no server, no refresh
. Any char\d Digit [0-9]\w Word char [a-zA-Z0-9_]\s Whitespace\b Word boundary^ Start of string$ End of string* 0 or more+ 1 or more? 0 or 1{n,m} n to m times(x|y) Alternation(x) Capture group(?:x) Non-capture group(?=x) Lookahead(?!x) Neg. lookahead