David Margolis created TIKA-3150:
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Summary: MimeType Regex End of Binary Fails
Key: TIKA-3150
URL: https://issues.apache.org/jira/browse/TIKA-3150
Project: Tika
Issue Type: Improvement
Components: config, detector
Affects Versions: 1.24.1, 1.24
Reporter: David Margolis
Fix For: 1.24.1
# Summary
Regular expressions for matching mime types in custom Tika config files fail
when trying to match exactly up to end of file with regex `$` operator or `{}`
operators.
# Steps to reproduce
Let's say, for example, we have a binary file that begins with 3 bytes,
followed by 4 0x00 bytes, and this whole pattern repeats 5 times. The following
should work for that situation
```
<mime-type type='application/MY_CUSTOM_FORMAT'>
<acronym>custom</acronym>
<magic priority='50'>
<match value="^([\\S\\s]{3}(\\x00){4}){5}$" type="regex" offset="24"/>
</match>
</mime-type>
```
The $ operator causes this regex to fail. Additionally, changing the regex to
match exactly 5 times to 6 times, does not cause the regex to fail, even though
this would cause the regex to match past the end of the file. Is this because
the regex is wrapping around the whole file back to the beginning?
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