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author	Paul Eggert <eggert@cs.ucla.edu>
	Tue, 26 Jan 2021 17:23:54 +0000 (09:23 -0800)
committer	Paul Eggert <eggert@cs.ucla.edu>
	Tue, 26 Jan 2021 17:24:41 +0000 (09:24 -0800)
commit	735083ba24878075235007b4417982ad5700436d
tree	9b29545fd8b7a6b0c31322e64c58321f1bb4cb94	tree \| snapshot
parent	bb21daa125aeb4e32546309d370918ca47e612db	commit \| diff

expr: fix bug with unmatched \(...\)

Problem reported by Qiuhao Li.
* NEWS: Mention this.
* doc/coreutils.texi (String expressions):
Document the correct behavior, which POSIX requires.
* src/expr.c (docolon): Treat unmatched \(...\) as empty.
* tests/misc/expr.pl: New test.

NEWS		diff \| blob \| blame \| history
doc/coreutils.texi		diff \| blob \| blame \| history
src/expr.c		diff \| blob \| blame \| history
tests/misc/expr.pl		diff \| blob \| blame \| history

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