Regular Expressions 101

^start of line

Negative Lookahead(?!\.)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[\w0-9\.]+

+matches at least one character from the set below:

\wany word character

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Negative Lookbehind(?<!\.)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

@+the literal @ (64₁₀ / 100₈ / 40₁₆) , repeated at least once

Negative Lookbehind(?<!\.)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[\w0-9\.]+

+matches at least one character from the set below:

\wany word character

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\w{1,3}any word character, repeated between 1 and 3 times

Group 1(\s*<[^>]+>)?

?repeats the group contents below at most once:

\s*any whitespace character, repeated any number of times

<the literal < (60₁₀ / 74₈ / 3C₁₆)

Negated Character Class[^>]+

+matches at least one character outside the set below:

>the literal > (62₁₀ / 76₈ / 3E₁₆)

$end of line

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

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Search reference

Regular Expression

^(?!\.)[\w0-9\.]+(?<!\.)@+(?<!\.)[\w0-9\.]+\.\w{1,3}(\s*<[^>]+>)?$

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