regex101: Strict Password Validator

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 (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(?=.*[^\w\d\s:])

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

Negated Character Class[^\w\d\s:]

\wany word character

\da digit

\sany whitespace character

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Group 1([^\s]){8,16}

{8,16}repeats the group contents below between 8 and 16 times:

Negated Character Class[^\s]

\sany whitespace character

$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

Quick Reference

26 tokens

Regular Expression

^(?=.*\d)(?=.*[A-Z])(?=.*[a-z])(?=.*[^\w\d\s:])([^\s]){8,16}$

/^(?=.*\d)(?=.*[A-Z])(?=.*[a-z])(?=.*[^\w\d\s:])([^\s]){8,16}$/gm
_}24I:9t58Tu?m@e
|YlzEc|1
#m_4xF%t"Bu5jeb$
Password1!
12345678aA
^@},^@},^@},
12345678aA@ 
12345678 aA@
 12345678aA@
AbCdEfGhIi
abcdefgh123
ABCDEFGH1234

Extraction

/^(?=.*\d)(?=.*[A-Z])(?=.*[a-z])(?=.*[^\w\d\s:])([^\s]){8,16}$/gm
_}24I:9t58Tu?m@e
|YlzEc|1
#m_4xF%t"Bu5jeb$
Password1!
12345678aA
^@},^@},^@},
12345678aA@ 
12345678 aA@
 12345678aA@
AbCdEfGhIi
abcdefgh123
ABCDEFGH1234