Regular Expressions 101

Pro

1st Alternative^(?=.*\btwo\b)(?=.*\bthree\b)(*SKIP)(*F)

^start of line

Positive Lookahead(?=.*\btwo\b)

.*any character (except for line terminators), repeated any number of times

\ban ASCII word boundary

twothe literal text two (case sensitive)

\ban ASCII word boundary

Positive Lookahead(?=.*\bthree\b)

.*any character (except for line terminators), repeated any number of times

\ban ASCII word boundary

threethe literal text three (case sensitive)

\ban ASCII word boundary

(*SKIP)acts like (*PRUNE), but the next unanchored match attempt starts where (*SKIP) was reached instead of at the next subject character

(*F)forces the current match attempt to fail at this position

2nd Alternative^.*$

^start of line

.*any character (except for line terminators), repeated any number of times

$end of line

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

25 tokens

^(?=.*\btwo\b)(?=.*\bthree\b)(*SKIP)(*F)|^.*$

New

one two three four
one two three
one two
one three
four
one two four three

one two three four
one two three
one two
one three
four
one two four three