Regular Expressions 101

Explanation

Pro

^start of line

Character Class[a-zA-Z0-9-]{4,}

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

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

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

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\ban ASCII word boundary

$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-zA-Z0-9-]{4,}\b$

New

eee0-lll
eee0
eEee-4

eeeed-

eee0-lll
eee0
eEee-4

eeeed-