grep vs egrep vs fgrep vs ripgrep: which to use
Compare grep, egrep, fgrep, and ripgrep (rg) to choose the fastest text search tool for your use case.
grep, egrep, fgrep, and ripgrep all search text for patterns, but they differ in regex support, speed, and default behavior.
How They Relate
egrep is equivalent to
grep -E— it enables Extended Regular Expressions.
fgrep is equivalent to
grep -F— it matches fixed strings without regex. Both
egrep and
fgrep are deprecated POSIX aliases; use
grep -E and
grep -F instead. ripgrep (
rg) is a modern alternative written in Rust that is significantly faster than GNU grep on large codebases.
Feature Comparison
| Feature | grep searches with BRE by default | grep -E (egrep) uses ERE | grep -F (fgrep) matches literal strings | ripgrep (rg) uses Rust regex engine with smart defaults |
|---|---|---|---|---|
| Regex support | Basic Regular Expressions (BRE):
\|,
\(\),
\{\} require escaping | Extended regex: ` | , ()
, {}
,+
,?` without escaping | No regex — matches the exact literal string |
| Speed on large files | grep processes files sequentially | Same speed as grep (same binary) | Faster than regex grep — no regex engine overhead | ripgrep is 2–10x faster than grep due to SIMD optimizations and parallel directory walking |
| Recursive search | grep requires
-r flag; searches all files including binary | Same as grep | Same as grep | ripgrep searches recursively by default, respects
.gitignore, skips binary files |
When to Use Each
Use
grep(BRE) for simple pattern matching in scripts and one-liners where POSIX compatibility matters.
Use
grep -Efor patterns requiring alternation (
|), groups, or quantifiers without escaping.
Use
grep -Ffor exact string matching — faster than regex and avoids escaping issues.
Use ripgrep (
rg)for searching large codebases, project directories, and any scenario where speed matters. ripgrep's
.gitignore awareness and smart defaults make it the best choice for developer workflows. Install with
sudo apt install ripgrep or
brew install ripgrep.