Regular Expressions 101

Explanation

Pro

^start of string

\w+any word character, repeated at least once

Group 1([-+.']\w+)*

*repeats the group contents below any number of times:

Character Class[-+.']

-the literal - (45₁₀ / 55₈ / 2D₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

\w+any word character, repeated at least once

@the literal @ (64₁₀ / 100₈ / 40₁₆)

\w+any word character, repeated at least once

Group 2([-.]\w+)*

*repeats the group contents below any number of times:

Character Class[-.]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\w+any word character, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\w+any word character, repeated at least once

Group 3([-.]\w+)*

*repeats the group contents below any number of times:

Character Class[-.]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\w+any word character, repeated at least once

$end of string

Global pattern flags

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Detailed match information will be displayed here automatically.

26 tokens

^\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$

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thomas-o'leary@upenn.org

thomas-o'leary@upenn.org