Regular Expressions 101

Explanation

Pro

^start of line

Positive Lookahead(?=.*\d)

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

\da digit

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(?=.*[-_@#$%])

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

Character Class[-_@#$%]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

$the literal $ (36₁₀ / 44₈ / 24₁₆)

%the literal % (37₁₀ / 45₈ / 25₁₆)

Character Class[-\w@#$%]{8,}

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\wany word character

@the literal @ (64₁₀ / 100₈ / 40₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

$the literal $ (36₁₀ / 44₈ / 24₁₆)

%the literal % (37₁₀ / 45₈ / 25₁₆)

$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)(?=.*[a-z])(?=.*[A-Z])(?=.*[-_@#$%])[-\w@#$%]{8,}$

a1B@xyz2
a1B@ xyz

a1B@xyz2
a1B@ xyz