Random Text generator based on regex [duplicate]

Question

I would like to know if there is software that, given a regex and of course some other constraints like length, produces random text that always matches the given regex. Thanks

Answer 1

Yes, software that can generate a random match to a regex:

• Exrex, Python
• Pxeger, Javascript
• regex-genex, Haskell
• Xeger, Java
• Xeger, Python
• Generex, Java
• rxrdg, C#
• String::Random, Perl
• regldg, C
• paggern, PHP
• ReverseRegex, PHP
• randexp.js, Javascript
• EGRET, Python/C++
• MutRex, Java
• Fare, C#
• rstr, Python
• randexp, Ruby
• goregen, Go
• bfgex, Java
• regexgen, Javascript
• strgen, Python
• random-string, Java
• regexp-unfolder, Clojure
• string-random, Haskell
• rxrdg, C#
• Regexp::Genex, Perl
• StringGenerator, Python
• strrand, Go
• regen, Go
• Rex, C#
• regexp-examples, Ruby
• genex.js, JavaScript
• genex, Go

Answer 2

Xeger is capable of doing it:

String regex = "[ab]{4,6}c"; Xeger generator = new Xeger(regex); String result = generator.generate(); assert result.matches(regex);