regexrand

regexrand is a library for generating matching string from a Go RE2 regular expression.

regexrand can be installed using go get:

go get github.com/multimikael/regexrand

Generate a string by calling GenerateMatch(&b, re, moreLimit)

• b is a strings.Builder where the result will be stored. The accumulated string of the builder can be returned by calling b.String().
• re is a given syntax.Regexp regular expression. This can be created using syntax.Parse.
• moreLimit is an int that determines the limit of "or more" operators. Using "or more" operator will generate a random integer between a minimum value and moreLimit.

• Any character operators only uses ASCII 32 to 126. Same applies for not char class operators.
• End of text does not contain EOF, it just stops the futher writing to the builder.
• No Match operator and Word Boundary is unsupported.

Here is a simple example of regexrand. This will print a string with a lowercase character and 1 or more (up to 10) digits between 1 and 9.

package main

import (
	"fmt"
	"regexp/syntax"
	"strings"

	"github.com/multimikael/regexrand"
)

func main() {
	re, err := syntax.Parse(`[a-z][1-9]+`, syntax.Perl)
	if err != nil {
		panic(err)
	}
	var b strings.Builder
	regexrand.GenerateMatch(&b, re, 10)
	fmt.Println(b.String())
}