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Building a Regex Engine From Scratch to Understand Backtracking

Build a basic regular expression engine in TypeScript to understand backtracking algorithms, NFAs, and Catastrophic Backtracking vulnerabilities.

Sachin Sharma
Sachin SharmaCreator
Aug 6, 2026
3 min read
Building a Regex Engine From Scratch to Understand Backtracking
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Build a basic regular expression engine in TypeScript to understand backtracking algorithms, NFAs, and Catastrophic Backtracking vulnerabilities.

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Sachin Sharma

Sachin Sharma

Software Developer & Mobile Engineer

Building digital experiences at the intersection of design and code. Sharing weekly insights on engineering, productivity, and the future of tech.

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