Regular Expressions 101

Explanation

Pro

Definition Group(?(DEFINE) (?<value>\d+(?:,\d+)?) (?<before>%\s+) (?<after>\s+%) )

Group value(?<value>\d+(?:,\d+)?)

\d+a digit, repeated at least once

Non-Capturing Group(?:,\d+)?

?repeats the group contents below at most once:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\d+a digit, repeated at least once

Group before(?<before>%\s+)

%the literal % (37₁₀ / 45₈ / 25₁₆)

\s+any whitespace character, repeated at least once

Group after(?<after>\s+%)

\s+any whitespace character, repeated at least once

%the literal % (37₁₀ / 45₈ / 25₁₆)

Branch Reset Group(?|(?P<mwst>(?&value))(?&after)|(?&before)(?P<mwst>(?&value)))

1st Alternative(?P<mwst>(?&value))(?&after)

Group mwst(?P<mwst>(?&value))

(?&value)calls group value as a subroutine

(?&after)calls group after as a subroutine

2nd Alternative(?&before)(?P<mwst>(?&value))

(?&before)calls group before as a subroutine

Group mwst(?P<mwst>(?&value))

(?&value)calls group value as a subroutine

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

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

Detailed match information will be displayed here automatically.

25 tokens

(?(DEFINE)
    (?<value>\d+(?:,\d+)?)
    (?<before>%\s+)
    (?<after>\s+%)
)

(?|(?P<mwst>(?&value))(?&after)|(?&before)(?P<mwst>(?&value)))

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