Regular Expressions 101

Pro

Negative Lookahead(?!(.*?C){2})

Group 1(.*?C){2}

{2}repeats the group contents below exactly 2 times:

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

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

Character Class[ABC]{3}

{3}matches exactly 3 characters from the set below:

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

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

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

Global pattern flags

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

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Detailed match information will be displayed here automatically.

25 tokens

(?!(.*?C){2})[ABC]{3}

New

ABC
ACB
CBA
BCA
AAB
ABA
BAA
AAC
ACA
CAA
ABB
BAB
BBA
BBB
CCC
CCA
CAC
ACC
CCB
CBC
BCC

ABC
ACB
CBA
BCA
AAB
ABA
BAA
AAC
ACA
CAA
ABB
BAB
BBA
BBB
CCC
CCA
CAC
ACC
CCB
CBC
BCC