> On Tue, Sep 27, 2011 at 08:15:09AM -0400, Greg Wooledge wrote: >On Mon, Sep 26, 2011 at 07:06:30PM -0800, Roger wrote: >> Some good reading I found is under the Bash Manual Page section "Parameter >> Expansion". >> >> From here, to learn more about regex/regexpr as the Bash Manual is quite >> brief >> on regex, use the following manual pages: >> >> perlretut - Gives a good from the start explanation of regular expressions, >> including perl > >Perl's regular expressions are not the same as Bash's. Bash uses standard >POSIX Extended Regular Expressions (ERE). You can find formal documentation >at >http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap09.html#tag_09_04 > >Or see "man egrep", as egrep (or grep -E) also uses EREs. Or see any >web page that discusses EREs. > >Avoid reading documentation from a different language (in this case Perl), >because the features tend to change. Perl uses a feature set and syntax >that have been retroactively dubbed Perl Compatible Regular Expressions >(PCRE). They're superficially similar to EREs, but have a much broader >range of features (extensions) that are not compatible and will not work >in Bash.
Correct. After reading the entire Bash Manual page, I didn't see much mention of documentation resources (of ERE) besides maybe something about egrep from Bash's Manual Page or elsewhere on the web. After extensive research for regex/regexpr, only found Perl Manual Pages. Might be worth mentioning a link or good reference for this ERE within the Bash Manual (Page)? -- Roger http://rogerx.freeshell.org/
