Regular Expressions 101

Pro

^start of line

Character Class[a-z]

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

Non-Capturing Group(?:[a-z\d]|[a-z\d]\-)*

*repeats the group contents below any number of times:

1st Alternative[a-z\d]

Character Class[a-z\d]

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

\da digit

2nd Alternative[a-z\d]\-

Character Class[a-z\d]

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

\da digit

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

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

$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.

25 tokens

^[a-z](?:[a-z\d]|[a-z\d]\-)*[a-z\d]+$

ab9cd-a9bc-abbbc95
ab9cd-a9bc-abbbc-asdfasd-asdf-2323324vc-95
5abcd
abbcd-fsjs-g-e-wa-q
-abcd
abcd--abcd