Regular Expressions 101

Pro

^start of line

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

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

\da digit

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

\da digit

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

\da digit

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

\da digit

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

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

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

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 character (except for line terminators), repeated at least once

$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.

26 tokens

^(?=.*\d.*?\d.*?\d.*?\d)(?=.*[a-zA-Z].*?[a-zA-Z]).+$

New

aa1111
b1b111
1111aa
11a1a1
1a11a1

aaaa11
bbb111
b1b1b1
b11b1b

aa1111
b1b111
1111aa
11a1a1
1a11a1

aaaa11
bbb111
b1b1b1
b11b1b