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 (65₁₀) to Z (90₁₀) (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 (97₁₀) to z (122₁₀) (case sensitive)

Positive Lookahead(?=.*[\d])

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

Character Class[\d]

\da digit

Group 1([A-Za-z\d]{8,})

Character Class[A-Za-z\d]{8,}

{8,}matches at least 8 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

$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]{8,})$

New

aaaaaaaa
AAAAAAAA
00000000
asdfFDSA167
#fFaf9374A
12345dfssA
123456NBh