regex101: PCRE (Legacy) Match Workspace

Pro

^start of line

Negative Lookahead(?!(?:[^A\n]*A){2})

Non-Capturing Group(?:[^A\n]*A){2}

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

Negated Character Class[^A\n]*

*matches any number of characters outside the set below:

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

\na line-feed (newline) character (ASCII 10)

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

Negative Lookahead(?!(?:[^B\n]*B){3})

Non-Capturing Group(?:[^B\n]*B){3}

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

Negated Character Class[^B\n]*

*matches any number of characters outside the set below:

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

\na line-feed (newline) character (ASCII 10)

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

Negative Lookahead(?!(?:[^C\n]*C){2})

Non-Capturing Group(?:[^C\n]*C){2}

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

Negated Character Class[^C\n]*

*matches any number of characters outside the set below:

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

\na line-feed (newline) character (ASCII 10)

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

Negative Lookahead(?!(?:[^D\n]*D){2})

Non-Capturing Group(?:[^D\n]*D){2}

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

Negated Character Class[^D\n]*

*matches any number of characters outside the set below:

Dthe literal D (68₁₀ / 104₈ / 44₁₆) (case sensitive)

\na line-feed (newline) character (ASCII 10)

Dthe literal D (68₁₀ / 104₈ / 44₁₆) (case sensitive)

Non-Capturing Group(?:[ABCD](?:\s|$)){3}

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

Character Class[ABCD]

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

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

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

Dthe literal D (68₁₀ / 104₈ / 44₁₆) (case sensitive)

Non-Capturing Group(?:\s|$)

1st Alternative\s

\sany whitespace character

2nd Alternative$

$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

25 tokens

Regular Expression

^(?!(?:[^A\n]*A){2})(?!(?:[^B\n]*B){3})(?!(?:[^C\n]*C){2})(?!(?:[^D\n]*D){2})(?:[ABCD](?:\s|$)){3}

Unit Tests

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