Method to get position of match in String within a range

Question

My question is very similar to this one

Except that I will be searching through very long strings (hundreds of megabytes) so I would like for the method to give up after a certain index.

Something like this except with an end index as well. Is there a library that provides this functionality?

You can do a `substring(0, endIndex)` and then call the `indexOf(match)` on the resulted string or just read how many bytes you need and then try matching. — RP-, Sep 10 '14 at 01:17
The following is **not** a duplicate. Hopefully it will give you additional ideas. [Fast alernative for String#indexOf(String str)](http://stackoverflow.com/questions/5564610/fast-alernative-for-stringindexofstring-str) — PM 77-1, Sep 10 '14 at 01:20

score 0 · Answer 1 · answered Sep 14 '14 at 08:45

Ye you can co this in 2 steps.

Get the Substring in which you want to search i.e. from beginning to the endIndex(or Certain index) using subString(0, certainIndex)
Then use indexOf(matchString) to find the location i=of the first occurence of the pattern into the String.

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