javimosch grex Plugin
Generate regular expressions from user-provided test cases. Supports digit, whitespace, word character conversions, repetition detection, case-insensitive matching, and capturing groups.
Commands
Regex Generation
grex regex generate— Generate regex from test cases
Utility
grex _ _— Passthrough to grex CLI
Usage Examples
- "Generate a regex from these strings"
- "Create a pattern matching these examples"
- "Convert these test cases to a regex"
- "Generate regex with character classes"
Installation
brew install grex
Or via Cargo:
cargo install grex
Examples
# Basic regex generation from test cases
grex regex generate a b c
# Read test cases from file
grex regex generate --file test_cases.txt
# Use Unix pipeline
cat test_cases.txt | grex regex generate -
# Convert digits to \\d
grex regex generate --digits 123 456 789
# Convert non-digits to \\D
grex regex generate --non-digits abc def ghi
# Convert whitespace to \\s
grex regex generate --spaces "hello world" "foo bar"
# Convert non-whitespace to \\S
grex regex generate --non-spaces helloworld foobar
# Convert word characters to \\w
grex regex generate --words hello_world foo_bar
# Convert non-word characters to \\W
grex regex generate --non-words hello@world foo#bar
# Escape non-ASCII characters
grex regex generate --escape "café" "naïve"
# Detect repeated substrings
grex regex generate --repetitions abcabc xyzxyz
# Specify minimum repetitions
grex regex generate --repetitions --min-repetitions 2 abcabc xyzxyz
# Specify minimum substring length
grex regex generate --repetitions --min-substring-length 2 abcabc xyzxyz
# Remove anchors
grex regex generate --no-anchors abc xyz
# Verbose mode for nicer regex
grex regex generate --verbose abc xyz
# Colorize output
grex regex generate --colorize abc xyz
# Case-insensitive matching
grex regex generate --ignore-case abc ABC xyz
# Use capturing groups
grex regex generate --capture-groups abc xyz
# Multiple options combined
grex regex generate --digits --words --verbose 123abc 456def
# Any grex command with passthrough
grex _ _ --digits --spaces abc 123
Key Features
- Test case input — Pass test cases directly or from file
- Pipeline support — Receive input from Unix pipes
- Character classes — Convert digits, whitespace, word characters
- Repetition detection — Detect repeated substrings automatically
- Anchor control — Add or remove start/end anchors
- Case options — Case-insensitive matching support
- Group options — Non-capturing or capturing groups
- Unicode support — Escape non-ASCII characters
- Syntax highlighting — Colorize output for readability
- Verbose mode — Generate nicer-looking regex
Notes
- Default includes both ^ and $ anchors
- Can read from stdin with
-argument - Supports Python library bindings
- Detects repetitions by default with min 1 repetition
- Useful for learning regex or automating pattern creation