Regular Expressions 101

^start of line

Group 1((?:[\w-]\.?)+)

Non-Capturing Group(?:[\w-]\.?)+

+repeats the group contents below at least once:

Character Class[\w-]

\wany word character

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

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

Non-Capturing Group(?:[\w-]+\.)+

+repeats the group contents below at least once:

Character Class[\w-]+

+matches at least one character from the set below:

\wany word character

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 3([A-Za-z]{2,4})

Character Class[A-Za-z]{2,4}

{2,4}matches between 2 and 4 characters from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

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.

26 tokens

Regular Expression

^((?:[\w-]\.?)+)@((?:[\w-]+\.)+)([A-Za-z]{2,4})

New

donkey.kong@kart.com.br
bowser1@games.info 
super-mario@nintendo.JP
TEAM.donkey-kong@MARIO.kart1.nintendo.com

toad@kart...com
wario@kart@nintendo.com
yoshi@nintendo
daisy@nintendo.b
..@email.com

Regular Expression

Substitution