Regular Expressions 101

Explanation

Pro

^start of line

v?optionally matches the literal v (118₁₀ / 166₈ / 76₁₆) (case sensitive)

Group 1([0-9]+!)?

?repeats the group contents below at most once:

Character Class[0-9]+

+matches at least one character from the set below:

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

!the literal ! (33₁₀ / 41₈ / 21₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

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

Group 2(\.[0-9]+)*

*repeats the group contents below any number of times:

\.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)

Group 3([-_\.]?(a|b|c|rc|alpha|beta|pre|preview)[-_\.]?[0-9]*)?

?repeats the group contents below at most once:

Character Class[-_\.]?

?matches at most one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 4(a|b|c|rc|alpha|beta|pre|preview)

1st Alternativea

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

2nd Alternativeb

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

3rd Alternativec

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

4th Alternativerc

rcthe literal text rc (case sensitive)

5th Alternativealpha

alphathe literal text alpha (case sensitive)

6th Alternativebeta

betathe literal text beta (case sensitive)

7th Alternativepre

prethe literal text pre (case sensitive)

8th Alternativepreview

previewthe literal text preview (case sensitive)

Character Class[-_\.]?

?matches at most one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[0-9]*

*matches any number of characters from the set below:

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

Group 5(-[0-9]+|[-_\.]?(post|rev|r)[-_\.]?[0-9]*)?

?repeats the group contents below at most once:

1st Alternative-[0-9]+

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

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

2nd Alternative[-_\.]?(post|rev|r)[-_\.]?[0-9]*

Character Class[-_\.]?

?matches at most one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 6(post|rev|r)

1st Alternativepost

postthe literal text post (case sensitive)

2nd Alternativerev

3rd Alternativer

Character Class[-_\.]?

Character Class[0-9]*

Group 7([-_\.]?dev[-_\.]?[0-9]*)?

Group 8(\+[a-z0-9]+([-_\.][a-z0-9]+)*)?

$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

Unit Test Summary

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Quick Reference

25 tokens

Regular Expression

^v?([0-9]+!)?[0-9]+(\.[0-9]+)*([-_\.]?(a|b|c|rc|alpha|beta|pre|preview)[-_\.]?[0-9]*)?(-[0-9]+|[-_\.]?(post|rev|r)[-_\.]?[0-9]*)?([-_\.]?dev[-_\.]?[0-9]*)?(\+[a-z0-9]+([-_\.][a-z0-9]+)*)?$

Unit Tests

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