regex101: PCRE2 (PHP) Match Workspace

Pro

Non-Capturing Group(?:\b(\p{Lu}\w*(?:\s+\p{Lu}\w*)*))?

?repeats the group contents below at most once:

\ban ASCII word boundary

Group 1(\p{Lu}\w*(?:\s+\p{Lu}\w*)*)

\p{Lu}an uppercase letter

\w*any word character, repeated any number of times

Non-Capturing Group(?:\s+\p{Lu}\w*)*

*repeats the group contents below any number of times:

\s+any whitespace character, repeated at least once

\p{Lu}an uppercase letter

\w*any word character, repeated any number of times

\s*any whitespace character, repeated any number of times

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Group 2([^()]*\d{4})

Negated Character Class[^()]*

*matches any number of characters outside the set below:

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

\d{4}a digit, repeated exactly 4 times

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

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

25 tokens

Regular Expression

(?:\b(\p{Lu}\w*(?:\s+\p{Lu}\w*)*))?\s*\(([^()]*\d{4})\)

New

This is a test. I only want to select the (cites) in parenthesis. I do not want it to return words in parenthesis that do not have years attached, such as abbreviations (abbr). For example, citing (Smith 2010) is something I would want to be returned. I would also want multiple citations returned separately such as (Smith 2010; Jones 2001; Brown 2020). I would also want Cooper (2015) returned as Cooper 2015, and not just 2015.

Substitution

This is a test. I only want to select the (cites) in parenthesis. I do not want it to return words in parenthesis that do not have years attached, such as abbreviations (abbr). For example, citing (Smith 2010) is something I would want to be returned. I would also want multiple citations returned separately such as (Smith 2010; Jones 2001; Brown 2020). I would also want Cooper (2015) returned as Cooper 2015, and not just 2015.