Regular Expressions 101

Group 1([A-Z]+[-_]?[0-9]{4,}([-_][0-9]{4,})?)

Character Class[A-Z]+

+matches at least one character from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Character Class[-_]?

?matches at most one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Character Class[0-9]{4,}

{4,}matches at least 4 characters from the set below:

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

Group 2([-_][0-9]{4,})?

?repeats the group contents below at most once:

Character Class[-_]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Character Class[0-9]{4,}

{4,}matches at least 4 characters from the set below:

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

Group 3([\._-].*)?

?repeats the group contents below at most once:

Character Class[\._-]

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

.*any character (except for line terminators), repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[\w]{3,4}

{3,4}matches between 3 and 4 characters from the set below:

\wany word character

$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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

([A-Z]+[-_]?[0-9]{4,}([-_][0-9]{4,})?)([\._-].*)?\.[\w]{3,4}$

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