regex101: Java Match Workspace

Pro

^start of line

Positive Lookahead(?=([bc]*a){3})

Group 1([bc]*a){3}

{3}repeats the group contents below exactly 3 times:

Character Class[bc]*

*matches any number of characters from the set below:

bthe literal b (98₁₀ / 142₈ / 62₁₆) (case sensitive)

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case sensitive)

athe literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

Positive Lookahead(?=([ca]*b){3})

Group 2([ca]*b){3}

{3}repeats the group contents below exactly 3 times:

Character Class[ca]*

*matches any number of characters from the set below:

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case sensitive)

athe literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

bthe literal b (98₁₀ / 142₈ / 62₁₆) (case sensitive)

Character Class[ab]*

*matches any number of characters from the set below:

athe literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

bthe literal b (98₁₀ / 142₈ / 62₁₆) (case sensitive)

Non-Capturing Group(?:c[ab]*c[ab]*c[abc]*)?

?repeats the group contents below at most once:

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case sensitive)

Character Class[ab]*

*matches any number of characters from the set below:

athe literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

bthe literal b (98₁₀ / 142₈ / 62₁₆) (case sensitive)

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case sensitive)

Character Class[ab]*

*matches any number of characters from the set below:

athe literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

bthe literal b (98₁₀ / 142₈ / 62₁₆) (case sensitive)

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case sensitive)

Character Class[abc]*

*matches any number of characters from the set below:

athe literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

bthe literal b (98₁₀ / 142₈ / 62₁₆) (case sensitive)

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case sensitive)

$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

27 tokens

Regular Expression

^(?=([bc]*a){3})(?=([ca]*b){3})[ab]*(?:c[ab]*c[ab]*c[abc]*)?$

New

aaabbb
ababab
aaabbbccc
abcabcabc
ababcabcc

ababcabccc

aaabbbc
aabbb
abbccc
abcabca

aaabbb
ababab
aaabbbccc
abcabcabc
ababcabcc

ababcabccc

aaabbbc
aabbb
abbccc
abcabca