Regular Expressions 101

Pro

Group 1([A-Fa-f0-9]{2})

Character Class[A-Fa-f0-9]{2}

{2}matches exactly 2 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)

Group 2([:\-\.]?)

Character Class[:\-\.]?

?matches at most one character from the set below:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Positive Lookahead(?=[A-Fa-f0-9])

Character Class[A-Fa-f0-9]

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)

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.

25 tokens

([A-Fa-f0-9]{2})([:\-\.]?)(?=[A-Fa-f0-9])

New

AA.BB.CC:DD:EE:FF

$1:

AA.BB.CC:DD:EE:FF