regex101: CSS RGB validation

Pro

^start of line

rgbthe literal text rgb (case sensitive)

a?optionally matches the literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Non-Capturing Group(?:(?:(?:[0-9]{1,3} ){2}[0-9]{1,3}|(?:[0-9]{1,3}% ){2}[0-9]{1,3}%)(?: \/ (?:[0-9]{1,3}%|1|0|0?\.[0-9]+))?|(?:(?:[0-9]{1,3}, ){2}[0-9]{1,3}|(?:[0-9]{1,3}%, ){2}[0-9]{1,3}%)(?:, (?:[0-9]{1,3}%|1|0|0?\.[0-9]+))?)

1st Alternative(?:(?:[0-9]{1,3} ){2}[0-9]{1,3}|(?:[0-9]{1,3}% ){2}[0-9]{1,3}%)(?: \/ (?:[0-9]{1,3}%|1|0|0?\.[0-9]+))?

Non-Capturing Group(?:(?:[0-9]{1,3} ){2}[0-9]{1,3}|(?:[0-9]{1,3}% ){2}[0-9]{1,3}%)

1st Alternative(?:[0-9]{1,3} ){2}[0-9]{1,3}

Non-Capturing Group(?:[0-9]{1,3} ){2}

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

Character Class[0-9]{1,3}

{1,3}matches between 1 and 3 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

the literal (32₁₀ / 40₈ / 20₁₆)

Character Class[0-9]{1,3}

{1,3}matches between 1 and 3 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

2nd Alternative(?:[0-9]{1,3}% ){2}[0-9]{1,3}%

Non-Capturing Group(?:[0-9]{1,3}% ){2}

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

Character Class[0-9]{1,3}

{1,3}matches between 1 and 3 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

% the literal text %

Character Class[0-9]{1,3}

{1,3}matches between 1 and 3 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

%the literal % (37₁₀ / 45₈ / 25₁₆)

Non-Capturing Group(?: \/ (?:[0-9]{1,3}%|1|0|0?\.[0-9]+))?

?repeats the group contents below at most once:

the literal (32₁₀ / 40₈ / 20₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

Non-Capturing Group(?:[0-9]{1,3}%|1|0|0?\.[0-9]+)

1st Alternative[0-9]{1,3}%

Character Class[0-9]{1,3}

{1,3}matches between 1 and 3 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

%the literal % (37₁₀ / 45₈ / 25₁₆)

2nd Alternative1

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

3rd Alternative0

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

4th Alternative0?\.[0-9]+

0?optionally matches the literal 0 (48₁₀ / 60₈ / 30₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

2nd Alternative(?:(?:[0-9]{1,3}, ){2}[0-9]{1,3}|(?:[0-9]{1,3}%, ){2}[0-9]{1,3}%)(?:, (?:[0-9]{1,3}%|1|0|0?\.[0-9]+))?

Non-Capturing Group(?:(?:[0-9]{1,3}, ){2}[0-9]{1,3}|(?:[0-9]{1,3}%, ){2}[0-9]{1,3}%)

1st Alternative(?:[0-9]{1,3}, ){2}[0-9]{1,3}

Non-Capturing Group(?:[0-9]{1,3}, ){2}

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

Character Class[0-9]{1,3}

{1,3}matches between 1 and 3 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

, the literal text ,

Character Class[0-9]{1,3}

{1,3}matches between 1 and 3 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

2nd Alternative(?:[0-9]{1,3}%, ){2}[0-9]{1,3}%

Non-Capturing Group(?:, (?:[0-9]{1,3}%|1|0|0?\.[0-9]+))?

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

$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

26 tokens

Regular Expression

^rgba?\((?:(?:(?:[0-9]{1,3} ){2}[0-9]{1,3}|(?:[0-9]{1,3}% ){2}[0-9]{1,3}%)(?: \/ (?:[0-9]{1,3}%|1|0|0?\.[0-9]+))?|(?:(?:[0-9]{1,3}, ){2}[0-9]{1,3}|(?:[0-9]{1,3}%, ){2}[0-9]{1,3}%)(?:, (?:[0-9]{1,3}%|1|0|0?\.[0-9]+))?)\)$

Unit Tests

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