regex101: PCRE (Legacy) Match Workspace

Pro

^start of line

Negative Lookahead(?!.{201})

.{201}any character (except for line terminators), repeated exactly 201 times

Positive Lookahead(?=(.{0,63}[^\.]@.{1,255}))

Group 1(.{0,63}[^\.]@.{1,255})

.{0,63}any character (except for line terminators), repeated between 0 and 63 times

Negated Character Class[^\.]

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

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

Negative Lookahead(?!.*[.?]{2})

.*any character (except for line terminators), repeated any number of times

Character Class[.?]{2}

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

.the literal . (46₁₀ / 56₈ / 2E₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

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 ! (33₁₀ / 41₈ / 21₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

$the literal $ (36₁₀ / 44₈ / 24₁₆)

%the literal % (37₁₀ / 45₈ / 25₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

\^the literal ^ (94₁₀ / 136₈ / 5E₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

`the literal ` (96₁₀ / 140₈ / 60₁₆)

{the literal { (123₁₀ / 173₈ / 7B₁₆)

|the literal | (124₁₀ / 174₈ / 7C₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

~the literal ~ (126₁₀ / 176₈ / 7E₁₆)

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 } (125₁₀ / 175₈ / 7D₁₆)

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]{0,}

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

!the literal ! (33₁₀ / 41₈ / 21₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

$the literal $ (36₁₀ / 44₈ / 24₁₆)

%the literal % (37₁₀ / 45₈ / 25₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

\^the literal ^ (94₁₀ / 136₈ / 5E₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

`the literal ` (96₁₀ / 140₈ / 60₁₆)

{the literal { (123₁₀ / 173₈ / 7B₁₆)

|the literal | (124₁₀ / 174₈ / 7C₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

~the literal ~ (126₁₀ / 176₈ / 7E₁₆)

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 @ (64₁₀ / 100₈ / 40₁₆)

Group 4((\[(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}\])|([a-zA-Z0-9-]{1,63}(\.[a-zA-Z0-9-]{2,63}){1,}))

1st Alternative(\[(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}\])

Group 5(\[(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}\])

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Group 6(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)

1st Alternative25[0-5]

25the literal text 25

Character Class[0-5]

0-5one character from 0 (48₁₀) to 5 (53₁₀)

2nd Alternative2[0-4][0-9]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-4]

0-4one character from 0 (48₁₀) to 4 (52₁₀)

Character Class[0-9]

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

3rd Alternative[01]?[0-9][0-9]?

Character Class[01]?

?matches at most one character from the set below:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]

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

Character Class[0-9]?

?matches at most one character from the set below:

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

Group 7(\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}

{3}repeats the group contents below exactly 3 times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 8(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)

1st Alternative25[0-5]

2nd Alternative2[0-4][0-9]

3rd Alternative[01]?[0-9][0-9]?

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

2nd Alternative([a-zA-Z0-9-]{1,63}(\.[a-zA-Z0-9-]{2,63}){1,})

$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

^(?!.{201})(?=(.{0,63}[^\.]@.{1,255}))(?!.*[.?]{2})([!#$%&'*+\-\/=?\^_`{|}~a-zA-Z0-9}]{1,64}(\.[!#$%&'*+\-\/=?\^_`{|}~a-zA-Z0-9]{0,}){0,})@((\[(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}\])|([a-zA-Z0-9-]{1,63}(\.[a-zA-Z0-9-]{2,63}){1,}))$

Unit Tests

There are no unit tests, click to add some.