Regular Expressions 101

^start of line

#the literal # (35₁₀ / 43₈ / 23₁₆)

Character Class[a-f0-9]{6}

{6}matches exactly 6 characters from the set below:

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

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

Non-Capturing Group(?:,\s*#[a-f0-9]{6})?

?repeats the group contents below at most once:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\s*any whitespace character, repeated any number of times

#the literal # (35₁₀ / 43₈ / 23₁₆)

Character Class[a-f0-9]{6}

{6}matches exactly 6 characters from the set below:

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-f0-9]{6}(?:,\s*#[a-f0-9]{6})?$

Test String
New

rgb(255,0,24)
rgb(255, 0, 24)
rgba(255, 0, 24, .5)
hsla(170, 23%, 25%, 0.2 )
#fff
#f2ewq
#0f243e
#0f243e,#3f54ae
#0f243eпп
#0f243eбб,#3f54aeпп
0x00ffff

Regular Expression

Test StringNew

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Test String
New

Extraction
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