Regular Expressions 101

#the literal # (35₁₀ / 43₈ / 23₁₆)

Negative Lookahead(?![\da-f]{6}|[\da-f]{3})

1st Alternative[\da-f]{6}

Character Class[\da-f]{6}

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

\da digit

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

2nd Alternative[\da-f]{3}

Character Class[\da-f]{3}

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

\da digit

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

.{0,7}any character (except for line terminators), repeated between 0 and 7 times

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

#(?![\da-f]{6}|[\da-f]{3}).{0,7}

html{   
    color: #e1e1e;
    background-color: #1e1e1e;
}
body{
    color: #55432c;
    background-color: #53e; 
}
div{
    color: #55h32c;
}