Regular Expressions 101

^start of line

#the literal # (35₁₀ / 43₈ / 23₁₆)

Non-Capturing Group(?:[A-Fa-f0-9]{3}){1,2}

{1,2}repeats the group contents below between 1 and 2 times:

Character Class[A-Fa-f0-9]{3}

{3}matches exactly 3 characters from the set below:

A-Fone character from A (65₁₀) to F (70₁₀) (case sensitive)

a-fone character from a (97₁₀) to f (102₁₀) (case sensitive)

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

$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-Fa-f0-9]{3}){1,2}$

New

#0F0F0F
#123
#1234
#ABC456
#1234567