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I'm looking for a tool that will allow me to run exact queries (and with this I mean searching for something like def main(s: Array[String]): Unit = {, containing any kind of symbols, over a set of directories in my hard-drive that can span tens of Gigabytes worth of files). The files will be periodically updated, so there should be a way to update the indexes efficiently. Optionally it would also be able to search for regex expressions, but that would also only be a nice to have. The returning results for a query should file the filename and the surrounding text.

The search should give the results back fairly quick (sub-second, ideally).

I'm aware of tools such as Elastic Search, but they seem to be targeting word search, not really "exact search". Or am I wrong?

I already did a prototype of something similar just for fun, but I'm right now deciding if I should proceed forward with this to solve my real world business issue, or just use a battle-tested, open-source solution instead.

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    how about the software choices? gratis, proprietary or any other things? – phuclv Sep 13 '18 at 1:47
  • other things like which operating system should it run on? – Mawg Sep 13 '18 at 9:07
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Free, multi-platform, fast, source code, ... (Some of these index inside compressed files, perform OCR, thesaurus search for similar words, SQL database indexing, provide instant results instead of waiting a second, etc.)

In order from simple to complicated and powerful:

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