Github user karanjeets commented on the pull request:
https://github.com/apache/oodt/pull/33#issuecomment-145977977
Sure. Here are the details:
* The Comparator expects two arguments - File object and a regular
expression (compare item).
* If all the below three conditions are met, then return **0**, else **1**:
* Regular Expression shouldn't be NULL.
* Regular Expression shouldn't be an empty string.
* File's absolute path matches with the regular expression.
**Example**
If we pass the below regular expression, the comparator will return 0 for
all the files where its absolute path contains ".svn" and returns 1 otherwise.
```
.*\\.svn.*
```
We are using this Comparator as part of a
[DRAT's](https://github.com/chrismattmann/drat) new feature (--exclude) where
we exclude processing of all files which contains some regular expression. In
short, this feature exclude all files where Comparator returns 0.
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