feat: add regex word filter (@benhuang3)

[benhuang3]

Description

This PR adds a regex filter to left column of words filter page, allowing users to filter words using regular expressions along with the other rules in the words filter tab.

• Like "exclude", box is cleared and expressions ignored when "exact match" is true.
• Parses string into regex using https://stackoverflow.com/a/874742
• Shows notification on invalid regex expressions and other errors
• Layout may not be suitable, please give suggestions!

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