regex

Technical Guide

An Index That Knows Where the Answer Cannot Be — Full Spectrum Part 2: 28.2x Over ripgrep on -E -v, and Level When Every Block Holds a Hit

Out of 92,239,125 lines, exactly one was a hit. Ask for the lines of a 3 GB OpenStreetMap XML file that do not…
2026.10.19
Technical Guide
Technical Guide

Regex With -i Runs 2.7-3.1x Slower Than ripgrep on a Cached File — Wide Field Part 9: Where .NET and Rust Regex Agree, and Where the Rewrite Changes Your Answer

[Update, 16 October 2026] Speed today — the second run of -E -i went from a 1/2.7–1/3.1 loss to faster than ri…
2026.10.05
Technical Guide
Technical Guide

Our -E Nearly Doubled the Time; ripgrep’s Didn’t — Part 4: Extracting Required Literals Took 50 GB -E From 13.68 s to 7.75 s

Only the regex path was slow. Same 50 GB file, same tool, same disk. The only difference is whether -E is on t…
2026.09.25
Technical Guide