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Bug 80666

Summary:	[find/replace] regex should support \R for any linebreak
Product:	[Eclipse Project] Platform	Reporter:	Markus Keller <markus.kell.r>
Component:	Text	Assignee:	Platform-Text-Inbox <platform-text-inbox>
Status:	RESOLVED FIXED	QA Contact:
Severity:	enhancement
Priority:	P3	Keywords:	helpwanted
Version:	3.1
Target Milestone:	3.4 M1
Hardware:	PC
OS:	Windows XP
Whiteboard:

Description Markus Keller

2004-12-10 03:20:24 EST

Find/Replace in regex mode should support the pattern \R, where \R matches a
linebreak in the current document's format. \R is proposed in this unicode
document, which is linked from java.util.regex.Pattern's javadoc:
http://www.unicode.org/unicode/reports/tr18/

The implementation could just replace \R in the find pattern by the document's
line delimiter.

Comment 1 Dani Megert

2004-12-10 03:37:25 EST

Not for 3.1

Comment 2 Markus Keller

2007-06-18 05:08:02 EDT

> The implementation could just replace \R in the find pattern by the document's
> line delimiter.

This will not work in all cases. E.g. for a Windows (\r\n) file, there's no straightforward way to replace \R in an expression like [x\R]\t, since character sets (in []) can only match single characters.

However, we could just replace \R with (?:\r\n?|\n) (a non-capturing group that matches any line delimiter) outside of characters sets and throw a PatternSyntaxException in case \R is used inside a character set (similar to what happens for e.g. (.)[\1]. That would solve most real cases and not try to solve the unsolvable.

See also bug 52338 and bug 80667.

Comment 3 Dani Megert

2007-07-15 10:33:26 EDT

Thanks Markus.
Patch committed to HEAD.
Available in builds > N20070715-0010.