Regular Expressions 101

^start of line

Group 1(\w+(\.|-)*\w+)+

+repeats the group contents below at least once:

\w+any word character, repeated at least once

Group 2(\.|-)*

*repeats the group contents below any number of times:

1st Alternative\.

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

2nd Alternative-

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\w+any word character, repeated at least once

@the literal @ (64₁₀ / 100₈ / 40₁₆)

Group 3(\w+-?\w+)+

+repeats the group contents below at least once:

\w+any word character, repeated at least once

-?optionally matches the literal - (45₁₀ / 55₈ / 2D₁₆)

\w+any word character, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-z]{2,3}

{2,3}matches between 2 and 3 characters from the set below:

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

Group 4(\.[a-z]{2})?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-z]{2}

{2}matches exactly 2 characters from the set below:

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

Global pattern flags

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(\w+(\.|-)*\w+)+@(\w+-?\w+)+\.[a-z]{2,3}(\.[a-z]{2})?

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