The regex library of matching characters has been growing in Javascript for a while. The Mozilla MDN for RegExp has a breakdown of what is supported, which may be well beyond what most people expect.

Here is the example for making a search box with a matched case which shows the searched text with the highlighted matches available. You have to paste your paragraph text in the text-area and enter ...

Google Analytics introduces regex support for event creation, offering greater flexibility, precision, and improved insights for marketers.