Regular Expressions 101

Explanation
Pro

Negative Lookbehind(?<!\\)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

Non-Capturing Group(?:\\\\)*

*repeats the group contents below any number of times:

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

Branch Reset Group(?|P?<([_A-Za-z]\w{0,31})>|'([_A-Za-z]\w{0,31})')

1st AlternativeP?<([_A-Za-z]\w{0,31})>

P?optionally matches the literal P (80₁₀ / 120₈ / 50₁₆) (case sensitive)

<the literal < (60₁₀ / 74₈ / 3C₁₆)

Group 1([_A-Za-z]\w{0,31})

Character Class[_A-Za-z]

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

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

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

\w{0,31}any word character, repeated between 0 and 31 times

>the literal > (62₁₀ / 76₈ / 3E₁₆)

2nd Alternative'([_A-Za-z]\w{0,31})'

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Group 1([_A-Za-z]\w{0,31})

Character Class[_A-Za-z]

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

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

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

\w{0,31}any word character, repeated between 0 and 31 times

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

(?<!\\)(?:\\\\)*\(\?(?|P?<([_A-Za-z]\w{0,31})>|'([_A-Za-z]\w{0,31})')

New

(?P<name>\w+): (?P<digit>\d+)
(?<name>\w+): (?'digit'\d+)
\(?P<name>\w+\): (?P<digit>\d+)
(\?P<name>\w+): (?P<digit>\d+)
(?<name1>.*(?<name2>pattern).*)