regex101: PCRE (Legacy) Match Workspace

Group release(?P<release>(?:0|[1-9])\d*(?:\.(?:0|[1-9]\d*)){2})

Non-Capturing Group(?:0|[1-9])

1st Alternative0

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

2nd Alternative[1-9]

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

\d*a digit, repeated any number of times

Non-Capturing Group(?:\.(?:0|[1-9]\d*)){2}

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:0|[1-9]\d*)

1st Alternative0

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

2nd Alternative[1-9]\d*

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

\d*a digit, repeated any number of times

Non-Capturing Group(?:-(?P<pre>(?P<prel>a|b|rc)(?P<pren>(?:0|[1-9])\d*)))?

?repeats the group contents below at most once:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group pre(?P<pre>(?P<prel>a|b|rc)(?P<pren>(?:0|[1-9])\d*))

Group prel(?P<prel>a|b|rc)

1st Alternativea

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

2nd Alternativeb

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

3rd Alternativerc

rcthe literal text rc (case sensitive)

Group pren(?P<pren>(?:0|[1-9])\d*)

Non-Capturing Group(?:0|[1-9])

1st Alternative0

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

2nd Alternative[1-9]

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

\d*a digit, repeated any number of times

Non-Capturing Group(?:\+(?P<local>[a-z\d]+(?:[-_\.][a-z\d]+)*))?

?repeats the group contents below at most once:

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

Group local(?P<local>[a-z\d]+(?:[-_\.][a-z\d]+)*)

Character Class[a-z\d]+

+matches at least one character from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

\da digit

Non-Capturing Group(?:[-_\.][a-z\d]+)*

*repeats the group contents below any number of times:

Character Class[-_\.]

Character Class[a-z\d]+

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

Search reference

Regular Expression

(?P<release>(?:0|[1-9])\d*(?:\.(?:0|[1-9]\d*)){2})(?:-(?P<pre>(?P<prel>a|b|rc)(?P<pren>(?:0|[1-9])\d*)))?(?:\+(?P<local>[a-z\d]+(?:[-_\.][a-z\d]+)*))?

Unit Tests

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