Regular Expressions 101

^start of line

Positive Lookahead(?=.*[a-z])

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

Character Class[a-z]

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

Positive Lookahead(?=.*[A-Z])

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

Character Class[A-Z]

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

Positive Lookahead(?=.*\d)

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

\da digit

Positive Lookahead(?=.*[@$!%*?&])

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

Character Class[@$!%*?&]

@the literal @ (64₁₀ / 100₈ / 40₁₆)

$the literal $ (36₁₀ / 44₈ / 24₁₆)

!the literal ! (33₁₀ / 41₈ / 21₁₆)

%the literal % (37₁₀ / 45₈ / 25₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

Character Class[A-Za-z\d@$!%*?&]{12,}

{12,}matches at least 12 characters from the set below:

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

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

\da digit

@the literal @ (64₁₀ / 100₈ / 40₁₆)

$the literal $ (36₁₀ / 44₈ / 24₁₆)

!the literal ! (33₁₀ / 41₈ / 21₁₆)

%the literal % (37₁₀ / 45₈ / 25₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

$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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{12,}$

mypassword@123

superSecretPa$$word123

sUp@rPa$$12