| Summary: | Perl regular expressions using negations broken in grep | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 5 | Reporter: | Petr Šplíchal <psplicha> |
| Component: | grep | Assignee: | Jaroslav Škarvada <jskarvad> |
| Status: | CLOSED WONTFIX | QA Contact: | BaseOS QE - Apps <qe-baseos-apps> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 5.6 | CC: | ohudlick |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2011-07-31 22:18:30 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
This request was evaluated by Red Hat Product Management for inclusion in the current release of Red Hat Enterprise Linux. Because the affected component is not scheduled to be updated in the current release, Red Hat is unfortunately unable to address this request at this time. Red Hat invites you to ask your support representative to propose this request, if appropriate and relevant, in the next release of Red Hat Enterprise Linux. PCRE can't limit the matching to single lines and each line in the buffer must be matched separately in order to get correct results. In RHEL-5 it causes problems only with PCRE matcher and some expressions. The fix is included in grep-2.6 in RHEL-6. That's why I am closing this as WONTFIX. |
Description of problem: Currently some of the perl regular expressions containing negations do not work as expected in grep. This does not seem to be a pcre bug as the same expressions work fine when tested by pcregrep. Version-Release number of selected component (if applicable): grep-2.5.1-55.el5.x86_64 Class negation ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # echo 'abcdef' | grep -P '[^a-f]' abcdef # echo 'abcdef' | pcregrep '[^a-f]' # echo 'abcdef' | grep '[^a-f]' Digit vs. non-digit: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # echo 3 | grep -P '\d' 3 # echo 3 | grep -P '\D' 3 # echo 3 | pcregrep '\d' 3 # echo 3 | pcregrep '\D' Word vs. non-word: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # echo x | grep -P '\w' x # echo x | grep -P '\W' x # echo x | pcregrep '\w' x # echo x | pcregrep '\W' White-space vs. non-white-space: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # echo nospace | grep -P '\s' nospace # echo nospace | grep -P '\S' nospace # echo nospace | pcregrep '\s' # echo nospace | pcregrep '\S' nospace Unicode properties ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # echo 'letter' | grep -P '\p{L}' letter # echo 'letter' | grep -P '\P{L}' letter # echo 'letter' | pcregrep '\p{L}' letter # echo 'letter' | pcregrep '\P{L}' Similarly for other negative properties: > :: [ FAIL ] :: Running 'echo 'letter' | grep -P '\P{L}'' (Expected 1, got 0) > :: [ FAIL ] :: Running 'echo 'lowerr' | grep -P '\P{Ll}'' (Expected 1, got 0) > :: [ FAIL ] :: Running 'echo 'UPPERR' | grep -P '\P{Lu}'' (Expected 1, got 0) > :: [ FAIL ] :: Running 'echo '999999' | grep -P '\P{N}'' (Expected 1, got 0) > :: [ FAIL ] :: Running 'echo '......' | grep -P '\P{P}'' (Expected 1, got 0) > :: [ FAIL ] :: Running 'echo '€€€€€€' | grep -P '\P{S}'' (Expected 1, got 0) > :: [ FAIL ] :: Running 'echo ' ' | grep -P '\P{Z}'' (Expected 1, got 0)