Pattern matching to find occurrences of their, their's, theirs, theirs, and theirs' using regular expressions

I am attempting to create a regex in JavaScript that matches the different forms of "their" and its possessive form.

Currently, I have their|their(?:'?s), which successfully matches their, theirs, and their's; but does not match theirs'.

Can anyone provide guidance on how to achieve this?

Therefore, their, theirs, their's, and theirs' should all be included in the regex pattern.

Considering that theirs, their, and theirs' share similarities, the regex should prioritize longer matches. For example, if the word is theirs', it should only match that and not just their or theirs.

How would one address scenarios involving his, his', his's, his, and avoid accidentally matching "hiss"?

javascriptregex

Answer №1

Enhancing the Efficiency of Regex

To get started, consider this:

their|theirs|their's|theirs'

An optimized version would be:

their(?:s'|'?s)?

or

their(?:s'?|'s)?

View example 1 and example 2.

Second Part: his|his'|his's excluding hiss

his(?:'s?)?(?!s)

See demonstration.

Answer №2

Is this what you're looking for?

their\'?s?\'?

SEE IT IN ACTION

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