Question 1

What's the difference between grep and ripgrep (rg)?

Accepted Answer

GNU grep is the ubiquitous baseline; ripgrep (rg) is a modern, fast alternative that respects .gitignore and skips hidden/binary files by default. Their flags differ in subtle ways: rg's -i is the same as grep's -i (ignore case), but rg uses --glob instead of --include/--exclude, rg's regex is Rust regex by default (similar to PCRE-ish) while grep defaults to BRE. This builder emits both commands side-by-side from the same intent and shows per-flag translation notes.

Question 2

Which regex flavors are supported?

Accepted Answer

Four: grep BRE (default basic regex with \{ \}  metacharacters), grep -E ERE (extended — same as egrep), grep -P PCRE (Perl-compatible — GNU grep only, not on BSD/macOS by default), and ripgrep's Rust regex (a modern PCRE-ish flavor with Unicode by default). The live pattern tester uses JavaScript's RegExp adapted to approximate each flavor — BRE escapes metacharacters that ERE doesn't, ERE adds ( ) { } + ? | without backslash, and PCRE/Rust regex adds \d \w \s shortcuts and lookahead/lookbehind (the tester approximates; always verify with the real tool for production use).

Question 3

How do file globs work in grep vs ripgrep?

Accepted Answer

grep uses --include='*.py' and --exclude='*.log' (multiple allowed, glob anchored to filename) and --exclude-dir='node_modules' for directories. ripgrep uses -g/--glob='*.py' (negate with leading !, e.g. -g '!*.log'), -t/--type=py for built-in file types, and -T/--type-not=py to exclude. The builder generates the right flags for whichever tool you target and explains the difference.

Question 4

Why does ripgrep skip some of my files?

Accepted Answer

By default rg respects .gitignore files, skips hidden files (those starting with .), and skips binary files. To override: -u (don't skip hidden), -uu (also don't skip .gitignore), -uuu (also search binary files — equivalent to grep -a -r on everything). The builder shows a note recommending -uuu when you toggle 'no filtering', and the explanation panel describes each default-filter behavior so search results are never a mystery.

Question 5

What extra features does this tool have?

Accepted Answer

(1) Side-by-side grep + rg commands from the same intent. (2) 8 toggle flags (ignore-case, whole-word, invert, count, line-numbers, recursive, fixed-string, only-matching). (3) 4 regex flavors (BRE / ERE / PCRE / Rust regex). (4) File include/exclude/type globs. (5) Context lines -A/-B/-C. (6) Live pattern tester with match highlighting per flavor. (7) Per-flag plain-English explanation for both tools. (8) grep↔rg translation table with default-behavior notes. (9) Replace preview (rg --replace, preview only). (10) Multiline toggle (rg -U). (11) Recipe library (10 common one-liners). (12) Sample-text presets (log, code, csv, config). (13) Shell-quoting of pattern. (14) Copy command + copy output. (15) localStorage history (max 20). (16) Shareable URL with embedded config + sample text. 100% client-side — your sample text never leaves the browser.

grep / ripgrep Command Builder

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