Java code to generate random string based on regex

Question

Java code to generate random string based on regex. I tried generex library , but it's not giving exact output. For example:

       Generex generex = new Generex("^[6-9]\\d{9}$");
       System.out.println(generex.random());

Output is : ^8677547981$ while i was expecting output to be 8677547981.It seems generex is not able to handle special characters like "^" , "$" etc.

Can someone pls help?

Try escaping the dollar sign: \\$

Dima
– Dima

2016-02-08 11:50:34 +00:00
Commented Feb 8, 2016 at 11:50 — Dima
– Dima, Commented Feb 8, 2016 at 11:50

Ferrybig · Accepted Answer · 2016-02-08 11:53:23Z

6

Generex doesn't need ^ and $. The content created by it matches the regex fully, instead of a partial match.

Generex generex = new Generex("[6-9]\\d{9}");
System.out.println(generex.random());

answered Feb 8, 2016 at 11:53

Ferrybig

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2 Comments

Jeff Vincent Over a year ago

The point is not that it generates the full string, but that ^ and $ are valid regex characters but it is treating them like literals. It should handle a valid regex without modification without introducing extraneous characters that would cause subsequent regex validation to fail.

Ferrybig Over a year ago

@JeffVincent You should register that bug at the Generex project, if there isn't a duplicate already, I'm not affiliated with the project

AGV · Accepted Answer · 2016-02-08 12:18:42Z

2

Generex uses dk.brics.automaton.RegExp class. It supports another set of regular expression operations as java.util.regex.Pattern. See RegExp API

answered Feb 8, 2016 at 12:18

AGV

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