[LUCENE-9336] RegExp.java - add support for character classes like \w

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 9.0
• Component/s: core/other
• Lucene Fields: New
• Assignee: Mark Harwood
• Reporter: Mark Harwood
• Created: 21/Apr/20 14:43
• Updated: 28/Aug/22 16:02
• Resolved: 14/May/20 09:38

Description

Character classes commonly used in regular expressions like \s for whitespace are not currently supported and may well be returning false negatives because they don't throw any "unsupported" errors.
The proposal is that the RegExp class add support for the set of character classes defined by Java's Pattern API

I can work on a patch if we think this is something we want to consider.