Re^4: Problem in pattern matching with alternation

Hi graff,
Here i am explaining in detail what actually i am trying to extract.
I am working on a task to get the vob storage path from the list of vobtags.below is the command i am running on command prompt
bash-3.00$cleartool lsvob -s #which will give all vobtag list as below.

/vobs/cs_test_scripts
/vobs/openwall_pam_userpass_rel
/vobs/cs_cim
/vobs/PIP_PVOB
/vobs/pvob_ic
/v_dialer3rdparty
/v_dialerclient
/v_dialer_rel
/scm
[download]

#!/usr/bin/perl -w
$arg=$ARGV[0];
$cmd="cleartool lsvob $arg"
$arr=`$cmd`;
print "$arr\n";
[download]

after running this script with argument as vobtag list that i got from running "cleartool lsvob -s" command
like as bash-3.0$cleartool lsvob /vobs/cs_test_scripts from command prompt will give the result as below

* /vobs/cs_test_scripts /usr/add-on/puccase_vob01/ccvob01/cs_test_scri
+pts.vbs public (replicated)
* /scm /usr/add-on/puccase_vob01/ccvob01/scm.test.vbs
[download]

the output contains three parts */vobs/cs_test_script,*/scm are as vobtags
/usr/add-on/puccase_vob01/ccvob01/cs_test_scripts.vbs is vobstorage directory path
and last part is type as "public (replicated)".
from this i want to extract vobstorage path of each vobtag that i am supling vobtag(/vobs/cs_test_script)as argument to the below script,in that i am matching the output for the tags with 2 slashes in it ex:/vobs/cs_test_script and
vobtag with one slash in it ex:/scm
with regular expression that has to match the output for both type of vobtags(/vobs/cs_test_script,/scm)by using alternation operator in patternmatching as below script

#!/usr/bin/perl
$arg=$ARGV[0];
$cmd1="cleartool lsvob  $arg";
$arr=`$cmd1`;
print "$arr\n";
$storage1=$1 if($arr=~/^*\s+\/\w+\/\w+\s+(.+)\s+\w+/);
print "$storage1\n";
$storage2=$1 if($arr=~/^*\s+\/\w+\s+(.+)\s+\w+/);
print "$storage2\n";
$storage3=$1 if($arr=~/^*\s+\/\w+\/\w+\s+(.+)\s+\w+|^*\s+\/\w+\s+(.+)\
+s+\w+/);
print "$storage3\n";
[download]

I am running the script with both type of vobtags as /vobs/cs_test_scripts and /scm as arguments so its printing the match for both $storage1 and $storage2 as below
bash-3.00$ perl scriptname.pl /vobs/cs_test_script
bash-3.00$ perl scriptname.pl /scm

* /vobs/cs_test_scripts /usr/add-on/puccase_vob01/ccvob01/cs_test_scri
+pts.vbs public (replicated)
#match storage1 /usr/add-on/puccase_vob01/ccvob01/cs_test_scripts.vbs
* /scm                 /usr/add-on/puccase_vob01/ccvob01/scm.vbs publi
+c (replicated)

#storage2 /usr/add-on/puccase_vob01/ccvob01/scm.vbs
[download]

In $storage3 variable i am combining the pattern match of storage1 and storage2 by alternation operator,it should work for both type of vobtag arguments,i am not getting where i am doing wrong...
Monks sorry for repeated posting of same qustion again and again...the problems seems to simple for u people ....

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Re^5: Problem in pattern matching with alternation by graff (Chancellor) on Aug 12, 2007 at 20:13 UTC
Here i am explaining in detail what actually i am trying to extract. And you seem to be completely ignoring (or not understanding) the code sample and suggestions that I posted. If you don't understand something I've said or something in my code, it's okay to quote me in a reply and say that you don't understand. i am matching the output for the tags with 2 slashes in it ex:/vobs/cs_test_script and vobtag with one slash in it ex:/scm with regular expression that has to match the output for both type of vobtags(/vobs/cs_test_script,/scm)by using alternation operator in pattern matching as below script Checking your code, I have learned something. I expected that if a regex that starts like this: `/^\s+/` it would be a syntax error, and the script would not run at all. But having tried it, I see that it does run (it's not an error), and it even seems to work: `$_=" foo"; m{^\s+foo}` returns true. Still, I prefer using a backslash when I want to match a literal "" character. Note that `m{\s+foo}` is a syntax error. (And make sure you understand the distinction: slash is "/", backslash is "\", and the two have very different meanings and uses in perl.) i am combining the pattern match of storage1 and storage2 by alternation operator* You don't need to use an alternation (`\|`) in the regex. The code that I suggested above uses a quantifier, so that one, two, three or more slashes in the path string can be treated by the single expression -- shown here with commentary: `m{^ # at the start of the string \* # match a literal asterisk character \s+ # then one or more whitespace characters (?: # begin a non-capturing group expression / # match a literal slash character \w+ # then one or more alphanumeric_word characters )+ # close the group, match 1 or more instances of that expr +ession \s+ # then one or more whitespace characters (\S+) # capture a group of non-whitespace characters }x # end of regex (x modifier lets comments and spacing be i +gnored)` [download] The last couple things that you are not paying attention to are: whether you need to be processing your data line by line, rather than slurping all the lines into a single "$arr" variable, and whether you would be better off using "split" instead of regex matches.	[reply] [d/l] [select]
Re^5: Problem in pattern matching with alternation by FunkyMonk (Bishop) on Aug 12, 2007 at 17:57 UTC
That's better (I think). Your input data look like this: `* /vobs/cs_test_scripts /usr/add-on/puccase_vob01/ccvob01/cs_test_scri +pts.vbs public (replicated) * /scm /usr/add-on/puccase_vob01/ccvob01/scm.test.vbs` [download] And your output should be: `/usr/add-on/puccase_vob01/ccvob01/cs_test_scripts.vbs /usr/add-on/puccase_vob01/ccvob01/scm.test.vbs` [download] I wouldn't do this with regular expressions, I'd use split: `my @data = ( "* /vobs/cs_test_scripts /usr/add-on/puccase_vob01/ccvob01/cs_test_s +cripts.vbs public (replicated)", "* /scm /usr/add-on/puccase_vob01/ccvob01/scm.test.vbs" ); for ( @data ) { my $path = (split)[2]; print "$path\n"; }` [download] Outputs: `/usr/add-on/puccase_vob01/ccvob01/cs_test_scripts.vbs /usr/add-on/puccase_vob01/ccvob01/scm.test.vbs` [download] Is that what you're after?	[reply] [d/l] [select]