Regular Expressions 101

^start of string

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

Positive Lookahead(?=.{3,})

.{3,}any character (except for line terminators), repeated at least 3 times

Positive Lookahead(?=.*[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)

Positive Lookahead(?=.*[0-9])

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

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

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

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

Character Class[\d\X]

\da digit

\Xthe literal X (88₁₀ / 130₈ / 58₁₆) (case sensitive)

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

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

Character Class[!$#%]

!the literal ! (33₁₀ / 41₈ / 21₁₆)

$the literal $ (36₁₀ / 44₈ / 24₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

%the literal % (37₁₀ / 45₈ / 25₁₆)

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

$end of string, or before its final line terminator

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Search reference

Regular Expression

^.*(?=.{3,})(?=.*[a-zA-Z])(?=.*[0-9])(?=.*[\d\X])(?=.*[!$#%]).*$

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