feat: for nth time→for the nth time

[hippietrail]

Issues

N/A

Description

Somewhere I came across someone using "for first time" instead of "for the first time". This is very common amongst people still learning English as a second language, and probably some native speakers writing in a hurry or abbreviated style write it sometimes too.

This works for all single-word ordinals from "first" to "billionth". Plus some casuals like "zeroth", "umpteenth", "nth".

It avoids cases where "first time" etc is part of an adjective such as "first time buyers" by only considering when "time" is the last word in a "chunk" or when followed by "and" or "but".

Fuzzing would be appreciated. Please file issues any false positives or false negatives found.

How Has This Been Tested?

cargo test

AI Disclosure

• I am a human and didn't use any AI.
• I used LLM features of my editor, but not an agent.
• I used an AI agent interactively.
• I am an agent or I got an agent to do the work autonomously.

If Your PR Implements or Enhances a Linter

• I made up the sentences in the unit tests.
• The sentences in the unit tests were generated by an AI.
• I'm using examples from the bug report / feature request.
• I collected real-world sentences for the unit tests.

Checklist

• I have performed a self-review of my own code
• I have added tests to cover my changes
• I have considered splitting this into smaller pull requests.