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Shell Programming and Scripting
ksh - Get last character from string - Bad Substitution error
Post 302900065 by Scrutinizer on Saturday 3rd of May 2014 02:44:33 PM
05-03-2014
Moderator
A note to add: POSIX grep can use ERE and so can BSD sed (both through the -E switch) and so can ksh93 and bash. And Perl uses its own form of Regular Expression, neither Extended, nor Basic. GNU utilities use extensions to both BRE and ERE. In a UNIX context term regexp does not just refer to BRE but to ERE as well (but not to pattern matching).
I agree with Alister (and with yourself ) - even when formally right in theoretical informatics lingo - it is confusing to call the pattern matching used in parameter expansion a "regular expression", since the POSIX standards consistently uses the terms "regular expression" and "pattern matching" to distinguish between the two.
Shell Command Language
Interesting nonetheless
@Alister: interesting point about BRE not being formal regular language while ERE is. So then GNU ERE is not, since it supports back references...
I agree with Alister (and with yourself ) - even when formally right in theoretical informatics lingo - it is confusing to call the pattern matching used in parameter expansion a "regular expression", since the POSIX standards consistently uses the terms "regular expression" and "pattern matching" to distinguish between the two.
Quote:
The pattern matching notation described in this section is used to specify patterns for matching strings in the shell. Historically, pattern matching notation is related to, but slightly different from, the regular expression notation described in XBD Regular Expressions. For this reason, the description of the rules for this pattern matching notation are based on the description of regular expression notation, modified to account for the differences.
Interesting nonetheless
@Alister: interesting point about BRE not being formal regular language while ERE is. So then GNU ERE is not, since it supports back references...
Last edited by Scrutinizer; 05-03-2014 at 04:13 PM..
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See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
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