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| From | Chet Ramey <chet.ramey@case.edu> |
| Newsgroups | gnu.bash.bug |
| Subject | Re: Incorrect example for `[[` command. |
| Date | Sat, 21 Sep 2019 17:15:19 -0400 |
| Organization | ITS, Case Western Reserve University |
| Lines | 23 |
| Approved | bug-bash@gnu.org |
| Message-ID | <mailman.747.1569100529.2190.bug-bash@gnu.org> (permalink) |
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| To | hk <hkadeveloper@gmail.com> |
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On 9/20/19 8:12 PM, hk wrote: > What is wrong is the description `zero or one instances of 'a''. But if we > correct the right hand side word to be `[[:space:]]*(a)?b' that it does > match what the description says.(the parenthese around `a' could be omitted). Yeah, that's the typo. > I was also wrong saying it was a pattern instead of a regular expression. > It is syntatically correct as a regular expression. That's true. According to the POSIX ERE definition, the `?' is a special ERE character in an invalid position (it's only special after a specifier that matches a single character, not after a separate specifier that matches multiple characters), so it matches itself. Chet -- ``The lyf so short, the craft so long to lerne.'' - Chaucer ``Ars longa, vita brevis'' - Hippocrates Chet Ramey, UTech, CWRU chet@case.edu http://tiswww.cwru.edu/~chet/
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Re: Incorrect example for `[[` command. Chet Ramey <chet.ramey@case.edu> - 2019-09-21 17:15 -0400
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