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# Reference websites, documents, and books
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*A Reference of References*
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2020-08-08 02:54:32 +00:00
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## Regular Expressions
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* [Regexr.com](https://regexr.com/ )
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## Firefox
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* [Firefox and the "about" protocol - Mozilla](https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/The_about_protocol )
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