Regular Expressions 101

^start of string

\S*any non-whitespace character, repeated any number of times

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(?=\S*[\W])

\S*any non-whitespace character, repeated any number of times

Character Class[\W]

\Wany non-word character

Character Class[a-zA-Z\d]{8,}

{8,}matches at least 8 characters from the set below:

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

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

\da digit

\S*any non-whitespace character, repeated any number of times

$end of string, or before its final line terminator

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Search reference

Regular Expression

^\S*(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=\S*[\W])[a-zA-Z\d]{8,}\S*$

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