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Regex: How to check if a string is not empty or blank and does not contain the character "<" and ">"? - Stack Overflow
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Everything you need to know about Regular Expressions | by Slawomir Chodnicki | Towards Data Science
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regex - Regular expression for a DFA that accepts the empty string as well as other strings - Stack Overflow
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Regex for Dummies. Part 5: Lookaround Assertions — Lookaheads and Lookbehinds | by NALSengineering | Medium
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