regex101: Optional Named Groups

Explanation

Pro

Redirecting to the literal text Redirecting to (case sensitive)

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

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

from=the literal text from= (case sensitive)

Group from(?P<from>[\.a-z0-9]+)

Character Class[\.a-z0-9]+

+matches at least one character from the set below:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

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

&exportFileName=the literal text &exportFileName= (case sensitive)

Group exportFileName(?P<exportFileName>[\.a-z0-9]+)

Character Class[\.a-z0-9]+

+matches at least one character from the set below:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

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

Non-Capturing Group(?:&to=(?P<to>[\.a-z0-9]+))?

?repeats the group contents below at most once:

&to=the literal text &to= (case sensitive)

Group to(?P<to>[\.a-z0-9]+)

Character Class[\.a-z0-9]+

+matches at least one character from the set below:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

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

Non-Capturing Group(?:\&lang=(?P<lang>[a-z]+))?

?repeats the group contents below at most once:

\&the literal & (38₁₀ / 46₈ / 26₁₆)

lang=the literal text lang= (case sensitive)

Group lang(?P<lang>[a-z]+)

Character Class[a-z]+

+matches at least one character from the set below:

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

Non-Capturing Group(?:\&action=(?P<action>[a-z\-]+))?

?repeats the group contents below at most once:

\&the literal & (38₁₀ / 46₈ / 26₁₆)

action=the literal text action= (case sensitive)

Group action(?P<action>[a-z\-]+)

Character Class[a-z\-]+

+matches at least one character from the set below:

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

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

Global pattern flags

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

X modifier: eXtra. A \ followed by a letter with no special meaning causes an error

Quick Reference

25 tokens

Regular Expression

Redirecting to .*?\?from=(?P<from>[\.a-z0-9]+)&exportFileName=(?P<exportFileName>[\.a-z0-9]+)(?:&to=(?P<to>[\.a-z0-9]+))?(?:\&lang=(?P<lang>[a-z]+))?(?:\&action=(?P<action>[a-z\-]+))?

New

Redirecting to /en/replacementOverview/?from=fa1e3273f2a2e5e8771dbd1ac8d0883f.xml&exportFileName=source.en.xlf&to=f2c3513085b9bda6012e5ce48e46a38d.xml&lang=de&action=overview-test

Substitution

Redirecting to /en/replacementOverview/?from=fa1e3273f2a2e5e8771dbd1ac8d0883f.xml&exportFileName=source.en.xlf&to=f2c3513085b9bda6012e5ce48e46a38d.xml&lang=de&action=overview-test