I think you can imagine I'm not going to talk about the police dog…
Rex is a utility designed by a team of Microsoft Research. It allows to generate strings that match a regular expression. Results can be saved to a file for easy use. An example of use:
Shell
> rex.exe "^[a-z]+$" /k:10 /file:toto.txt
/k:10 generates 10 results/file:toto.txt save results to a file
For instance, here's the generated strings:
d
ux
gxh
k
lo
ze
m
jvl
u
som
Rex makes it very convenient to generate data for testing. In addition it is a .NET executable file, so it is possible to use it in your own applications.
https://www.microsoft.com/en-us/research/project/rex-regular-expression-exploration
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