Regular Expressions 101

Pro

Positive Lookahead(?=(?P<section>Sections?\W+(\w+)(\(\w+\))?(, (\w+)(\(\w+\))?)*))

Group section(?P<section>Sections?\W+(\w+)(\(\w+\))?(, (\w+)(\(\w+\))?)*)

Sectionthe literal text Section (case sensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

\W+any character that is not a Unicode word character, repeated at least once

Group 2(\w+)

\w+a Unicode word character, repeated at least once

Group 3(\(\w+\))?

?repeats the group contents below at most once:

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\w+a Unicode word character, repeated at least once

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

Group 4(, (\w+)(\(\w+\))?)*

*repeats the group contents below any number of times:

, the literal text ,

Group 5(\w+)

\w+a Unicode word character, repeated at least once

Group 6(\(\w+\))?

?repeats the group contents below at most once:

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\w+a Unicode word character, repeated at least once

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

(?P=section)the text saved by group section

Negative Lookahead(?! of)

ofthe literal text of (case sensitive)

Global pattern flags

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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

(?=(?P<section>Sections?\W+(\w+)(\(\w+\))?(, (\w+)(\(\w+\))?)*))(?P=section)(?! of)

New


1) Section 23

2) Section 45(3)

3) point (e) of Section 75

4) Sections 21(1), 54(2), 78(1)

5) Section 45 of JKL

6) Sections 21(1), 54(2), 78(1) of Harry Potter

Substitution


1) Section 23

2) Section 45(3)

3) point (e) of Section 75

4) Sections 21(1), 54(2), 78(1)

5) Section 45 of JKL

6) Sections 21(1), 54(2), 78(1) of Harry Potter