Thanks Voile

Thanks for the suggestion:-) java just added

@myjinxin2015, I stole some of you guys' ideas to create very similar solution. Btw, would you please advice how can i get this kata out of beta version please? thanks in advance!

Yup, cheers!

Random tests added

You both have so excellent solution, intelligent guys, this is called 1kyu! clear and short.
I will copy one of yours to use for random test, if no objection

Thanks, have added

Added example, would you check if it makes a bit more sense please

Good advice, would you please help to contribute the random tests please if you have time, Thanks

what is a great test case!!!!, excellent design, great thanks

Please could the author reivew my code, i think my code should be fine, Thank you very much

not sure what does this mentions: "Please note that these chainable calls do not return the current object"

always failed as following:
symucxkj() should not exist in same object as xdtrlqbx(). Chainable calls should not return current object! - Expected: true, instead got: false

the second parameter indicate that the found index cannot be greater than 1.
even found matchs but if greater than 1, need to return -1