Regular Expressions 101

Pro

^start of line

Positive Lookahead(?=.{8,22}$)

.{8,22}any Unicode character (except for line terminators), repeated between 8 and 22 times

$end of line

Negative Lookahead(?!.*(.)\1{2})

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

Group 1(.)

.any Unicode character (except for line terminators)

\1{2}the text saved by group 1, repeated exactly 2 times

Positive Lookahead(?=(?:\D*\d){2})

Non-Capturing Group(?:\D*\d){2}

{2}repeats the group contents below exactly 2 times:

\D*any character that is not a Unicode decimal digit, repeated any number of times

\da Unicode decimal digit

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

Negated Character Class[^A-Z]*

*matches any number of characters outside the set below:

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

Character Class[A-Z]

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

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

Negated Character Class[^a-z]*

*matches any number of characters outside the set below:

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

Character Class[a-z]

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

Character Class[a-zA-Z]

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

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

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

$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.

25 tokens

^(?=.{8,22}$)(?!.*(.)\1{2})(?=(?:\D*\d){2})(?=[^A-Z]*[A-Z])(?=[^a-z]*[a-z])[a-zA-Z].*$

New

asasas4aS5as.
asasaaa4aS5a

asasas4aS5as.
asasaaa4aS5a