Regular Expressions 101

\ba Unicode word boundary

Non-Capturing Group(?: (?P<match_this> b\s+ (?: (?!c\s+(?:\S+\s+){1,3}e |d\s+(?:\S+\s+){1,3}g) \S+\s+){1,3} f) |(?P<not_overlap1>d\s+(?:\S+\s+){1,3}g) |(?P<not_overlap2>c\s+(?:\S+\s+){1,3}e) )

1st Alternative (?P<match_this> b\s+ (?: (?!c\s+(?:\S+\s+){1,3}e |d\s+(?:\S+\s+){1,3}g) \S+\s+){1,3} f)

Group match_this(?P<match_this> b\s+ (?: (?!c\s+(?:\S+\s+){1,3}e |d\s+(?:\S+\s+){1,3}g) \S+\s+){1,3} f)

bthe literal text b (case sensitive)

\s+a Unicode whitespace character, repeated at least once

Non-Capturing Group(?: (?!c\s+(?:\S+\s+){1,3}e |d\s+(?:\S+\s+){1,3}g) \S+\s+){1,3}

{1,3}repeats the group contents below between 1 and 3 times:

Negative Lookahead(?!c\s+(?:\S+\s+){1,3}e |d\s+(?:\S+\s+){1,3}g)

1st Alternativec\s+(?:\S+\s+){1,3}e

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case sensitive)

\s+a Unicode whitespace character, repeated at least once

Non-Capturing Group(?:\S+\s+){1,3}

{1,3}repeats the group contents below between 1 and 3 times:

\S+any character that is not Unicode whitespace, repeated at least once

\s+a Unicode whitespace character, repeated at least once

e the literal text e (case sensitive)

2nd Alternatived\s+(?:\S+\s+){1,3}g

dthe literal d (100₁₀ / 144₈ / 64₁₆) (case sensitive)

\s+a Unicode whitespace character, repeated at least once

Non-Capturing Group(?:\S+\s+){1,3}

{1,3}repeats the group contents below between 1 and 3 times:

\S+any character that is not Unicode whitespace, repeated at least once

\s+a Unicode whitespace character, repeated at least once

gthe literal g (103₁₀ / 147₈ / 67₁₆) (case sensitive)

\S+any character that is not Unicode whitespace, repeated at least once

\s+a Unicode whitespace character, repeated at least once

fthe literal text f (case sensitive)

2nd Alternative(?P<not_overlap1>d\s+(?:\S+\s+){1,3}g)

Group not_overlap1(?P<not_overlap1>d\s+(?:\S+\s+){1,3}g)

dthe literal d (100₁₀ / 144₈ / 64₁₆) (case sensitive)

\s+a Unicode whitespace character, repeated at least once

Non-Capturing Group(?:\S+\s+){1,3}

{1,3}repeats the group contents below between 1 and 3 times:

\S+any character that is not Unicode whitespace, repeated at least once

\s+a Unicode whitespace character, repeated at least once

gthe literal g (103₁₀ / 147₈ / 67₁₆) (case sensitive)

3rd Alternative(?P<not_overlap2>c\s+(?:\S+\s+){1,3}e)

Group not_overlap2(?P<not_overlap2>c\s+(?:\S+\s+){1,3}e)

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case sensitive)

\s+a Unicode whitespace character, repeated at least once

Non-Capturing Group(?:\S+\s+){1,3}

{1,3}repeats the group contents below between 1 and 3 times:

\S+any character that is not Unicode whitespace, repeated at least once

\s+a Unicode whitespace character, repeated at least once

ethe literal e (101₁₀ / 145₈ / 65₁₆) (case sensitive)

\ba Unicode word boundary

Global pattern flags

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

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

x

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25 tokens

Regular Expression

\b(?:
(?P<match_this>
  b\s+
  (?:
    (?!c\s+(?:\S+\s+){1,3}e
      |d\s+(?:\S+\s+){1,3}g)
    \S+\s+){1,3}
  f)
|(?P<not_overlap1>d\s+(?:\S+\s+){1,3}g)
|(?P<not_overlap2>c\s+(?:\S+\s+){1,3}e)
)\b

Unit Tests

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