Regular Expressions 101

^start of line

Character Class[0-9-]{0,8}

{0,8}matches between 0 and 8 characters from the set below:

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 1([-][0-9-]{0,8})?

?repeats the group contents below at most once:

Character Class[-]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[0-9-]{0,8}

{0,8}matches between 0 and 8 characters from the set below:

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

$end of line

Global pattern flags

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^[0-9-]{0,8}([-][0-9-]{0,8})?$

New

20220623-19563352
20220623-18261367
20220606-15484894
20220606-15484
20220606
20220606-15
202206
33333333-33333333333
5453345345345353434646
3463334334535
202206a
2022067-+

Regular Expression

Extraction