Reggenerator

Generate random string based on supplied regex

Quick start

Lib

go get github.com/toncek345/reggenerator
Import and call Generate(regex string, count int).

If the random generation function is not being changed, rand.Int will be used.
Seeding with rand.Seed(time.Now().UnixNano()) is then recommended.

How to change the random number generation

reggenerator.RandFn = randomFn
---
reggenerator.RandFn = func() int { return X }

Standalone

go install github.com/toncek345/reggenerator/reggenerator@v1.1.0

> reggenerator --help
Usage of cmd:
  -count int
    	number of random string (default 1)
  -regex string
    	regex for random string

Syntax

. Match any character except newline
[ Start character class definition
] End character class definition
? 0 or 1 quantifier
{ Start min/max quantifier
} End min/max quantifier

Within the class:
^ Negate the class, but only if the first character
- Indicates character range

Examples

> /[-+]?[0-9]{1,16}[.][0-9]{1,6}/
-1752643936.096896
9519688.31
+1.7036
+65048.3876
-6547028036936294.111
07252345.650
-27557.78
7385289878518.439775
13981103761187.90
4100273498885.614

> /[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{8}/
eb4bbfa4-11d4-bce9-0f56e2dc
d896fd6b-9bfe-d0ae-6fb05b52
b36dcaeb-5654-73aa-c9ec7de2

> /.{8,12}/
(<W[+]%i
7QEyw0th
rEF\Ly(C

> /[^aeiouAEIOU0-9]{5}/
#DTdH
B[n<F
rsQgV

> /[a-f-]{5}/
-cfbc
ab---
----f