Regular Expressions 101

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

.*any Unicode 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 Unicode 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(?=.*[0-9])

.*any Unicode 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(?=.*[\u0020-\u002f\u003A-\u0040\u005B-\u0060\u007B-\u007E])

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

Character Class[\u0020-\u002f\u003A-\u0040\u005B-\u0060\u007B-\u007E]

\u0020-\u002fone character from (32₁₀) to / (47₁₀)

\u003A-\u0040one character from : (58₁₀) to @ (64₁₀)

\u005B-\u0060one character from [ (91₁₀) to ` (96₁₀)

\u007B-\u007Eone character from { (123₁₀) to ~ (126₁₀)

.{8,}any Unicode character (except for line terminators), repeated at least 8 times

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

u modifier: unicode. Makes \w, \W, \b, \B, \d, \D, \s, and \S use Unicode semantics (redundant in Python 3)

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Search reference

Regular Expression

(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.*[\u0020-\u002f\u003A-\u0040\u005B-\u0060\u007B-\u007E]).{8,}

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