lwall@jpl-devvax.JPL.NASA.GOV (Larry Wall) (05/26/90)
In article <1933@pyrltd.UUCP> jimmy@pyrltd.UUCP (Jimmy Aitken) writes:
: (Patchlevel 18, runiing under OSx4.4c on a Pyramid)
:
: I'm trying to read in a file, and split on a delimieter that seperates
: different records. In the test case below, these are a line of 7 '-'
: signs. I can split on a simple string, but I want to guard against
: the case where the pattern could be included elsewhere. In the case
: shown below, it works with the exception that record 2 line 3 is sent
: into a speerate array element.
:
: I've tried all possible combinations of pattern matching that I can
: think of to specify a unique pattern for split, but tnothing seems to
: work as I expect it. I would expect that setting $artsep to
: "^-------$" to do what I want, but it does not. Have I read the
: manual wrong, and if so, can someone point me in the correct direction
: please?
Go ahead and use "^-------$" but set $* to enable multi-line pattern matching.
Otherwise the ^ only matches on the beginning of the string because
the pattern matcher is optimizing on the assumption that your string only
contains one line.
Larrymleone@f.gp.cs.cmu.edu (Mark Leone) (05/26/90)
On a related note, why doesn't split allow a case-insensitive pattern? I.e., split(/$word/i, $string). It seems like all the other pattern operations support case-insensitivity! Is there some other good way to do this when $word and $string are not known at compile-time? -- Mark R. Leone <mleone@cs.cmu.edu> Computer Science, Carnegie Mellon University Pittsburgh, PA 15213
merlyn@iwarp.intel.com (Randal Schwartz) (05/26/90)
In article <9423@pt.cs.cmu.edu>, mleone@f.gp (Mark Leone) writes: | | On a related note, why doesn't split allow a case-insensitive pattern? | I.e., split(/$word/i, $string). It seems like all the other pattern | operations support case-insensitivity! | | Is there some other good way to do this when $word and $string are not | known at compile-time? Well, as a bit of a hack, I could suggest: sub isplit { # &isplit(word,string) => array local($word,$_) = @_; local(@ind,@result,$start,$end); @ind = (0); s#$word#push(ind,length($`),length($`.$&)),$&#ieg; push(ind,length); # @ind now has pairs of indicies (0-origin) into $_ # that bound the non-$word items; convert into result: while (@ind) { $start = shift(ind); $end = shift(ind); push(result,substr($_,$start+$[,$end-$start)); } @result; } print join(":",&isplit("z","foo z bar Z bletch")),"\n"; print join(":",&isplit("x*y","foo xy bar xxxy bletch XxXxY bug")),"\n"; Yup, doesn't handle the equiv of split(/(a)/i, $string). Anyone care to try that? This is all I could do in the 20 minutes I had to play with this today. print &isplit("z","JzuZsztZ zaZnzoZtzhZezrZ zPZezrZlz ZhzaZczkZezrZ,"); -- /=Randal L. Schwartz, Stonehenge Consulting Services (503)777-0095 ==========\ | on contract to Intel's iWarp project, Beaverton, Oregon, USA, Sol III | | merlyn@iwarp.intel.com ...!any-MX-mailer-like-uunet!iwarp.intel.com!merlyn | \=Cute Quote: "Welcome to Portland, Oregon, home of the California Raisins!"=/
lwall@jpl-devvax.JPL.NASA.GOV (Larry Wall) (05/26/90)
In article <9423@pt.cs.cmu.edu> mleone@f.gp.cs.cmu.edu (Mark Leone) writes:
:
: On a related note, why doesn't split allow a case-insensitive pattern?
: I.e., split(/$word/i, $string). It seems like all the other pattern
: operations support case-insensitivity!
:
: Is there some other good way to do this when $word and $string are not
: known at compile-time?
Uh, I don't have any trouble with split(/$word/i,$string). Are you sure
you didn't just try split(/x/i, $string) and generalize from that? The
case of a single explicit split letter doesn't work right, but I can't
get anything else to misbehave here, including if $word is a single char.
By the way, the next patch will fix split(/x/i).
Larrymleone@f.gp.cs.cmu.edu (Mark Leone) (05/28/90)
In article <8209@jpl-devvax.JPL.NASA.GOV> lwall@jpl-devvax.JPL.NASA.GOV (Larry Wall) writes: >Uh, I don't have any trouble with split(/$word/i,$string). Are you sure >you didn't just try split(/x/i, $string) and generalize from that? The >case of a single explicit split letter doesn't work right, but I can't >get anything else to misbehave here, including if $word is a single char. Oops! You're right, I lept to the wrong conclusion by testing a single explicit letter (and reading the documentation :-). Thanks for setting me straight. - Mark