Regular Expressions 101

\ban ASCII word boundary

Positive Lookahead(?=[0-9]*[a-f])

Character Class[0-9]*

*matches any number of characters from the set below:

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

Character Class[a-f]

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

Positive Lookahead(?=[a-f]*[0-9])

Character Class[a-f]*

*matches any number of characters from the set below:

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

Character Class[0-9]

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

Character Class[a-f0-9]{8}

{8}matches exactly 8 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)

\ban ASCII word boundary

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

\b(?=[0-9]*[a-f])(?=[a-f]*[0-9])[a-f0-9]{8}\b

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