DEV Community

Regular Expressions

A regular expression (shortened as regex or regexp also referred to as regular expression) is a sequence of characters that specifies a search pattern.

Posts

đź‘‹ Sign in for the ability to sort posts by relevant, latest, or top.
Seven guards, six languages, and the payment keyword that would have refused every listing on Idealista

Seven guards, six languages, and the payment keyword that would have refused every listing on Idealista

Comments
6 min read
I built a daily regex game. Scoring regex fairly was the hard part

I built a daily regex game. Scoring regex fairly was the hard part

Comments
5 min read
I built a regex debugger that shows every backtrack (flame graph included)

I built a regex debugger that shows every backtrack (flame graph included)

Comments
3 min read
Testing automata-theory exercises in the browser: a regex flavor for CS coursework

Testing automata-theory exercises in the browser: a regex flavor for CS coursework

Comments
2 min read
Benchmarking regex patterns properly: P95/P99, equivalence checks, real engines

Benchmarking regex patterns properly: P95/P99, equivalence checks, real engines

Comments
2 min read
Your Regex Works in Python but Breaks in JavaScript - Here's Why

Your Regex Works in Python but Breaks in JavaScript - Here's Why

Comments
2 min read
One Regular Expression Held the Server for Forty Seconds

One Regular Expression Held the Server for Forty Seconds

1
Comments
2 min read
Regex Cheatsheet for Beginners (With Copy-Paste Examples)

Regex Cheatsheet for Beginners (With Copy-Paste Examples)

Comments
3 min read
Cloudflare outage 2019: how one regex caused 27 minutes of 502s

Cloudflare outage 2019: how one regex caused 27 minutes of 502s

1
Comments
8 min read
Your test fixtures are lying to you: what 13 real Minecraft crash reports taught me

Your test fixtures are lying to you: what 13 real Minecraft crash reports taught me

1
Comments
5 min read
Regular Expressions Without the Fear

Regular Expressions Without the Fear

Comments
3 min read
Regular Expressions Without the Fear

Regular Expressions Without the Fear

Comments
3 min read
How I built a VS Code extension that draws Railroad diagrams for regex and catches ReDoS

How I built a VS Code extension that draws Railroad diagrams for regex and catches ReDoS

1
Comments
4 min read
I scraped 89 job postings to find out how my salary parser was lying to me

I scraped 89 job postings to find out how my salary parser was lying to me

Comments
9 min read
Four filters returned nothing and I read all four as nothing being there

Four filters returned nothing and I read all four as nothing being there

6
Comments
3 min read
đź‘‹ Sign in for the ability to sort posts by relevant, latest, or top.