A regex matcher written in Go. Functionality is a subset of grep

How to run

Use the grep-go.sh script to build and run the matcher. The command will exit with code 0 on a successful match, and exit code 1 otherwise.

Usage

echo -n [text] | ./grep-go.sh -E [regex]

Example

echo -n "abcd" | ./grep-go.sh -E "ab" # exits with code 0
echo -n "abcd" | ./grep-go.sh -E "z" # exits with code 1

Supported syntax

• Character literals
• Digit class \d and the alphanumeric class \w
• Positive character groups [abc]
• Negative character groups [^abc]
• Start of string anchor ^, and end of string anchor $
• One or more quantifier +
• Zero or one quantifier ?
• Wild card .
• Alternation to combine multiple patterns (abc|def)
• Backreferences up to 9 groups, with nesting allowed (\w+) and \1