Grep

Searches file contents using regular expressions. Built on ripgrep, which searches recursively, respects .gitignore, and handles large codebases without choking.

Runtime Comparison

Aspect	Claude Code	Opencode
Tool name	Grep	grep
Engine	ripgrep	ripgrep
Regex syntax	Full regex support	Full regex support
Case insensitive	-i parameter	ignoreCase option
Context lines	-A, -B, -C parameters	Supported
File filtering	glob or type parameters	include parameter

Use Grep to find where a function is defined or called, locate error messages, or trace imports across modules.

Combine with Glob for targeted searches: find files by name first, then search within them.