Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

Pattern Matching

Posted on 2002-05-28
3
Medium Priority
?
406 Views
Last Modified: 2010-03-05
I'm trying to develop a pattern to search through all my scripts for a particular subroutine call that does NOT have a particular paramter. For example, I'm looking for "dbConnect" where "fileName" is not a paramter between the parentheses. Such calls may span multiple lines. I'm having difficulty coming up with the pattern that will match:

dbConnect ();
dbConnect('user');
dbConnect ('user',
           line);

but not match:

dbConnect('user', fileName);
dbConnect ('user',
           line,
           fileName);

because "fileName" exists in these. Any help on this is greatly appreciated. Thanks.
0
Comment
Question by:davev
  • 2
3 Comments
 
LVL 10

Expert Comment

by:rj2
ID: 7040021
#!/usr/bin/perl
use strict;

my $match =<<END;
dbConnect ('user',
          line);
END

my $dontmatch=<<END;
dbConnect ('user',
          line,
          fileName);
END

test($match);
test($dontmatch);

sub test {
     my($s) = $_[0];
     if($s =~ /dbConnect\s*\(.*?[^f][^i][^l][^e][^N][^a][^m][^e].*?\)/gm) {
          print "Matched $s\n";
     } else {
          print "Did not match $s\n";
     }
}    
         
     
0
 

Author Comment

by:davev
ID: 7040065
That code behaves correctly as is, but if:

my $match = "dbConnect ('user', line);";
my $dontmatch = "dbConnect ('user', line, fileName);";

where the string is all on one line, then they both say match, but one obviously shouldn't. I have no way of knowing whether the dbConnect call is going to span multiple lines or not.
0
 
LVL 10

Accepted Solution

by:
rj2 earned 200 total points
ID: 7040119
#!/usr/bin/perl
use strict;

my $match = "dbConnect ('user', line);";
my $dontmatch = "dbConnect ('user', line, fileName);";


test($match);
test($dontmatch);

sub test {
     my($s) = $_[0];
     if($s =~ /(dbConnect\s*\((.|\s)*?\))/gm) {    
          my($s2)=$1;
          if($s2 =~ /fileName/) {
               print "Did not match $s\n";
          } else {
               print "Matched $s\n";
          }          
     } else {
          print "Did not match $s\n";
     }
}    
         
0

Featured Post

Get expert help—faster!

Need expert help—fast? Use the Help Bell for personalized assistance getting answers to your important questions.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Many time we need to work with multiple files all together. If its windows system then we can use some GUI based editor to accomplish our task. But what if you are on putty or have only CLI(Command Line Interface) as an option to  edit your files. I…
There are many situations when we need to display the data in sorted order. For example: Student details by name or by rank or by total marks etc. If you are working on data driven based projects then you will use sorting techniques very frequently.…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…
Six Sigma Control Plans
Suggested Courses

580 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question