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| From: | Paul Eggert |
| Subject: | bug#29613: Debian Bug#883733: grep returns 0 even if there is no match |
| Date: | Fri, 8 Dec 2017 10:34:53 -0800 |
| User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 |
On 12/08/2017 03:11 AM, Santiago R.R. wrote:
$ echo 1111111111111 | grep -E '^(11+)\1+$|^1?$' ; echo $? 1111111111111 0 Shouldn't the last grep command exit 1 too?
Yes it should. This appears to be due to a longstanding bug in the glibc regular expression matcher. See:
https://sourceware.org/bugzilla/show_bug.cgi?id=11053
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