Regular Expressions 101

Pro

the literal (32₁₀ / 40₈ / 20₁₆)

Positive Lookahead(?=.*?(?P<a>A)?.*)

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

Group a(?P<a>A)?

?repeats the group contents below at most once:

Athe literal A (65₁₀ / 101₈ / 41₁₆) (case sensitive)

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

Positive Lookahead(?=.*(?P<b>B).*)?

?repeats the group contents below at most once:

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

Group b(?P<b>B)

Bthe literal B (66₁₀ / 102₈ / 42₁₆) (case sensitive)

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

Positive Lookahead(?=.*(?P<c>C).*)?

?repeats the group contents below at most once:

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

Group c(?P<c>C)

Cthe literal C (67₁₀ / 103₈ / 43₁₆) (case sensitive)

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

Global pattern flags

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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

 (?=.*?(?P<a>A)?.*)(?=.*(?P<b>B).*)?(?=.*(?P<c>C).*)?

New

some_text_here A B C
some_text_here A C B
some_text_here B C 
some_text_here C