Regular Expressions 101

Explanation

Pro

Positive Lookahead(?=.*one)

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

onethe literal text one (case sensitive)

Positive Lookahead(?=.*two)

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

twothe literal text two (case sensitive)

Positive Lookahead(?=.*three)

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

threethe literal text three (case sensitive)

Positive Lookahead(?=[^A-Z]*[A-Z][^A-Z]*[A-Z])

Negated Character Class[^A-Z]*

*matches any number of characters outside the set below:

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

Character Class[A-Z]

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

Negated Character Class[^A-Z]*

*matches any number of characters outside the set below:

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

Character Class[A-Z]

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

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

Negated Character Class[^a-z]*

*matches any number of characters outside the set below:

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

Character Class[a-z]

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

Negated Character Class[^a-z]*

*matches any number of characters outside the set below:

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

Character Class[a-z]

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

Positive Lookahead(?=\D*\d\D*\d)

\D*any character that's not a digit, repeated any number of times

\da digit

\D*any character that's not a digit, repeated any number of times

\da digit

Positive Lookahead(?=[A-Za-z0-9]*[^A-Za-z0-9][A-Za-z0-9]*[^A-Za-z0-9])

Character Class[A-Za-z0-9]*

*matches any number of characters from the set below:

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

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

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Negated Character Class[^A-Za-z0-9]

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

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

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Character Class[A-Za-z0-9]*

*matches any number of characters from the set below:

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

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

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Negated Character Class[^A-Za-z0-9]

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

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

0-9one character from 0 (48₁₀) to 9 (57₁₀)

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

$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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

(?=.*one)(?=.*two)(?=.*three)(?=[^A-Z]*[A-Z][^A-Z]*[A-Z])(?=[^a-z]*[a-z][^a-z]*[a-z])(?=\D*\d\D*\d)(?=[A-Za-z0-9]*[^A-Za-z0-9][A-Za-z0-9]*[^A-Za-z0-9]).*$

onetwothreeABab12@#

Substitution

onetwothreeABab12@#