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#grep (3)

Cheat sheets (3)

grep — Pattern Search

Search files and streams using fixed strings, extended regex, or PCRE. Covers all major flags, context, recursive search, and pipeline patterns.
grep regex search text-processing cli pipes web-researched

PCRE — Perl Compatible Regular Expressions

PCRE2 syntax reference — character classes, quantifiers, anchors, groups, lookarounds, backreferences, flags, and advanced features used in grep, sed, nginx, PHP, and dozens of other tools.
pcre regex grep linux cli patterns web-researched

ripgrep (rg) — Fast Recursive Search

Modern grep replacement written in Rust. Respects .gitignore, searches hidden files optionally, supports PCRE2, and is significantly faster on large codebases.
ripgrep rg grep search text-processing cli rust web-researched