Regular Expressions 101

^start of line

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

1st Alternative.*[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)

2nd Alternative()

Group 1() — does not consume characters

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

1st Alternative.*[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)

2nd Alternative()

Group 2() — does not consume characters

Positive Lookahead(?=[^0-9\r\n]+$|())

1st Alternative[^0-9\r\n]+$

Negated Character Class[^0-9\r\n]+

+matches at least one character outside the set below:

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

\ra carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

$end of line

2nd Alternative()

Group 3() — does not consume characters

Positive Lookahead(?=[^\\!-\/:-@\[\]-`{-~\r\n]+$|())

1st Alternative[^\\!-\/:-@\[\]-`{-~\r\n]+$

Negated Character Class[^\\!-\/:-@\[\]-`{-~\r\n]+

+matches at least one character outside the set below:

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

!-\/one character from ! (33₁₀) to / (47₁₀)

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

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\]-`one character from ] (93₁₀) to ` (96₁₀)

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

\ra carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

$end of line

2nd Alternative()

Group 4() — does not consume characters

Positive Lookahead(?=.{2,40}$|())

1st Alternative.{2,40}$

.{2,40}any character (except for line terminators), repeated between 2 and 40 times

$end of line

2nd Alternative()

Group 5() — does not consume characters

.+any character (except for line terminators), repeated at least once

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.

Search reference

Regular Expression

^(?=.*[A-Z]|())(?=.*[a-z]|())(?=[^0-9\r\n]+$|())(?=[^\\!-\/:-@\[\]-`{-~\r\n]+$|())(?=.{2,40}$|()).+

New

9876LKIU
P,a
]

Regular Expression

Extraction