Regular Expressions 101

Positive Lookahead(?=[a-fA-F0-9]*[a-fA-F])

Character Class[a-fA-F0-9]*

*matches any number of characters from the set below:

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

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

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

Character Class[a-fA-F]

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

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

Character Class[a-fA-F0-9]{10}

{10}matches exactly 10 characters from the set below:

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

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

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

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]*[a-fA-F])[a-fA-F0-9]{10}

New

111111111a
7777dddddd
9999999999
88888888A
88888888AAA
88888A
AAAAAAAAA