Regular Expressions 101

Explanation

Pro

Positive Lookahead(?=.{8,15}$)

.{8,15}any character (except for line terminators), repeated between 8 and 15 times

$end of line

Positive Lookahead(?=.*[A-Za-z\d])

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

Character Class[A-Za-z\d]

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

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

\da digit

Negative Lookahead(?!([ -\/:-@[-`{-~À-ÿ])\1{4})

Group 1([ -\/:-@[-`{-~À-ÿ])

Character Class[ -\/:-@[-`{-~À-ÿ]

-\/one character from (32₁₀) to / (47₁₀)

:-@one character from : (58₁₀) to @ (64₁₀)

[-`one character from [ (91₁₀) to ` (96₁₀)

{-~one character from { (123₁₀) to ~ (126₁₀)

À-ÿone character from À (192₁₀) to ÿ (255₁₀) (case sensitive)

\1{4}the text saved by group 1, repeated exactly 4 times

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

Detailed match information will be displayed here automatically.

25 tokens

(?=.{8,15}$)(?=.*[A-Za-z\d])(?!([ -\/:-@[-`{-~À-ÿ])\1{4}).*

New

AABBCCDD
aaaaaaaa
11111111
a1a1a1a1
AA@@@@AA
A1C EKFE
AADE   F