regex101: mongo db email validation

Pro

^start of string

Non-Capturing Group(?:[a-zA-Z0-9])

Character Class[a-zA-Z0-9]

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 1([-_0-9a-zA-Z]+(\.[-_0-9a-zA-Z]+)*|^\"([\001-\010\013\014\016-\037!#-\[\]-\177]|\\[\001-011\013\014\016-\177])*\")

1st Alternative[-_0-9a-zA-Z]+(\.[-_0-9a-zA-Z]+)*

Character Class[-_0-9a-zA-Z]+

+matches at least one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

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

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

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

Group 2(\.[-_0-9a-zA-Z]+)*

*repeats the group contents below any number of times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[-_0-9a-zA-Z]+

+matches at least one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

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

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

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

2nd Alternative^\"([\001-\010\013\014\016-\037!#-\[\]-\177]|\\[\001-011\013\014\016-\177])*\"

^start of string

\"the literal " (34₁₀ / 42₈ / 22₁₆)

Group 3([\001-\010\013\014\016-\037!#-\[\]-\177]|\\[\001-011\013\014\016-\177])*

*repeats the group contents below any number of times:

1st Alternative[\001-\010\013\014\016-\037!#-\[\]-\177]

Character Class[\001-\010\013\014\016-\037!#-\[\]-\177]

\001-\010one character from (1₁₀) to (8₁₀)

\013the literal (13₈ / 11₁₀ / B₁₆)

\014the literal (14₈ / 12₁₀ / C₁₆)

\016-\037one character from (14₁₀) to (31₁₀)

!the literal ! (33₁₀ / 41₈ / 21₁₆)

#-\[one character from # (35₁₀) to [ (91₁₀)

\]-\177one character from ] (93₁₀) to (127₁₀)

2nd Alternative\\[\001-011\013\014\016-\177]

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

Character Class[\001-011\013\014\016-\177]

\001-0one character from (1₁₀) to 0 (48₁₀)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\013the literal (13₈ / 11₁₀ / B₁₆)

\014the literal (14₈ / 12₁₀ / C₁₆)

\016-\177one character from (14₁₀) to (127₁₀)

\"the literal " (34₁₀ / 42₈ / 22₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

Non-Capturing Group(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+

+repeats the group contents below at least once:

Character Class[a-zA-Z0-9]

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)

Non-Capturing Group(?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?

?repeats the group contents below at most once:

Character Class[a-zA-Z0-9-]{0,61}

{0,61}matches between 0 and 61 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)

Character Class[a-zA-Z0-9]

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 . (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)

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

$end of string

25 tokens

Regular Expression

^(?:[a-zA-Z0-9])([-_0-9a-zA-Z]+(\.[-_0-9a-zA-Z]+)*|^\"([\001-\010\013\014\016-\037!#-\[\]-\177]|\\[\001-011\013\014\016-\177])*\")@(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,6}\.?$

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