Regular Expressions 101

^start of line

Negative Lookahead(?![\d@.]*$)

Character Class[\d@.]*

*matches any number of characters from the set below:

\da digit

@the literal @ (64₁₀ / 100₈ / 40₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

$end of line

\w+any word character, repeated at least once

Non-Capturing Group(?:\.\w+){0,2}

{0,2}repeats the group contents below between 0 and 2 times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\w+any word character, repeated at least once

@the literal @ (64₁₀ / 100₈ / 40₁₆)

\w+any word character, repeated at least once

Non-Capturing Group(?:\.\w+){0,2}

{0,2}repeats the group contents below between 0 and 2 times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\w+any word character, repeated at least once

$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

^(?![\d@.]*$)\w+(?:\.\w+){0,2}@\w+(?:\.\w+){0,2}$

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