regex101: PCRE (Legacy) Match Workspace

^start of line

Positive Lookahead(?=(.{1,64}@.{1,255}))

Group 1(.{1,64}@.{1,255})

.{1,64}any character (except for line terminators), repeated between 1 and 64 times

@the literal @ (64₁₀ / 100₈ / 40₁₆)

.{1,255}any character (except for line terminators), repeated between 1 and 255 times

Group 2([-+%_a-zA-Z0-9]{1,64}(\.[-+%_a-zA-Z0-9][^.]{0,}){0,})

Character Class[-+%_a-zA-Z0-9]{1,64}

{1,64}matches between 1 and 64 characters from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

%the literal % (37₁₀ / 45₈ / 25₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

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

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

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

Group 3(\.[-+%_a-zA-Z0-9][^.]{0,}){0,}

{0,}repeats the group contents below any number of times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[-+%_a-zA-Z0-9]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

%the literal % (37₁₀ / 45₈ / 25₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

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

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

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

Negated Character Class[^.]{0,}

{0,}matches any number of characters outside the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

Negated Character Class[^-\.@#!$&^*~`={}|'"?]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

!the literal ! (33₁₀ / 41₈ / 21₁₆)

$the literal $ (36₁₀ / 44₈ / 24₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

^the literal ^ (94₁₀ / 136₈ / 5E₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

~the literal ~ (126₁₀ / 176₈ / 7E₁₆)

`the literal ` (96₁₀ / 140₈ / 60₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

{the literal { (123₁₀ / 173₈ / 7B₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

|the literal | (124₁₀ / 174₈ / 7C₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

Group 4([a-zA-Z0-9_]{1,63}(\.[a-zA-Z0-9-]{0,}){0,}[^.](?!.web)(\.[a-zA-Z]{2,6}){1,4})

Character Class[a-zA-Z0-9_]{1,63}

{1,63}matches between 1 and 63 characters from the set below:

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

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

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

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group 5(\.[a-zA-Z0-9-]{0,}){0,}

{0,}repeats the group contents below any number of times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-zA-Z0-9-]{0,}

{0,}matches any number of characters from the set below:

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

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

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Negated Character Class[^.]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Negative Lookahead(?!.web)

.any character (except for line terminators)

webthe literal text web (case sensitive)

Group 6(\.[a-zA-Z]{2,6}){1,4}

{1,4}repeats the group contents below between 1 and 4 times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-zA-Z]{2,6}

{2,6}matches between 2 and 6 characters from the set below:

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

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

$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

25 tokens

Regular Expression

^(?=(.{1,64}@.{1,255}))([-+%_a-zA-Z0-9]{1,64}(\.[-+%_a-zA-Z0-9][^.]{0,}){0,})@[^-\.@#!$&^*~`={}|'"?]([a-zA-Z0-9_]{1,63}(\.[a-zA-Z0-9-]{0,}){0,}[^.](?!.web)(\.[a-zA-Z]{2,6}){1,4})$

Unit Tests

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