Regular Expressions 101

Explanation

Pro

1st Alternative([A-Z]{1,9}-[0-9]{2,4}\s:?)

Group 1([A-Z]{1,9}-[0-9]{2,4}\s:?)

Character Class[A-Z]{1,9}

{1,9}matches between 1 and 9 characters from the set below:

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[0-9]{2,4}

{2,4}matches between 2 and 4 characters from the set below:

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

\sany whitespace character

:?optionally matches the literal : (58₁₀ / 72₈ / 3A₁₆)

2nd Alternative([0-9]{0,2}_.*-[0-9]{0,2}_)

Group 2([0-9]{0,2}_.*-[0-9]{0,2}_)

Character Class[0-9]{0,2}

{0,2}matches between 0 and 2 characters from the set below:

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

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[0-9]{0,2}

{0,2}matches between 0 and 2 characters from the set below:

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

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

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.

25 tokens

([A-Z]{1,9}-[0-9]{2,4}\s:?)|([0-9]{0,2}_.*-[0-9]{0,2}_)

GQSD-65 : title
GQSD-65 title
01_Définitions-04_

GQSD-65 : title
GQSD-65 title
01_Définitions-04_