regex101: RFC5322-Email-Id-WHATWG

Pro

^start of string

Positive Lookahead(?=.{3,254}$)

.{3,254}any character (except for line terminators), repeated between 3 and 254 times

$end of string

Character Class[\w\!#\$%&'\*\+\/\=\?\^_`\{\|\}~\-]

\wany word character

\!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 / (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)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 1([\w\.\!#\$%&'\*\+\/\=\?\^_`\{\|\}~\-]{0,62}[\w\!#\$%&'\*\+\/\=\?\^_`\{\|\}~\-])?

?repeats the group contents below at most once:

Character Class[\w\.\!#\$%&'\*\+\/\=\?\^_`\{\|\}~\-]{0,62}

{0,62}matches between 0 and 62 characters from the set below:

\wany word character

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\!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 / (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)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[\w\!#\$%&'\*\+\/\=\?\^_`\{\|\}~\-]

\wany word character

\!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 / (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)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

Character Class[\w]

\wany word character

Group 2([\w-]{0,61}[\w])?

?repeats the group contents below at most once:

Character Class[\w-]{0,61}

{0,61}matches between 0 and 61 characters from the set below:

\wany word character

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[\w]

\wany word character

Group 3(\.[\w]([\w-]{0,61}[\w])?)*

*repeats the group contents below any number of times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[\w]

\wany word character

Group 4([\w-]{0,61}[\w])?

?repeats the group contents below at most once:

Character Class[\w-]{0,61}

{0,61}matches between 0 and 61 characters from the set below:

\wany word character

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[\w]

\wany word character

$end of string

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

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

26 tokens

Regular Expression

^(?=.{3,254}$)[\w\!#\$%&'\*\+\/\=\?\^_`\{\|\}~\-]([\w\.\!#\$%&'\*\+\/\=\?\^_`\{\|\}~\-]{0,62}[\w\!#\$%&'\*\+\/\=\?\^_`\{\|\}~\-])?@[\w]([\w-]{0,61}[\w])?(\.[\w]([\w-]{0,61}[\w])?)*$

New

Regular Expressions 101

Regular Expression

Extraction