CODEWITHSUNDEEP
stringperl
carol
carol

Reputation: 171

perl string exact match in another string

If I want to find a specific (constant) string in another string, does the =~ do the job or is it better to use another operator? Should I use /^ $/?

use constant {
MYSTR => "HGjfslT",
};

if (MYSTR =~ $rec_str){
...
}

Cheers,

Carol

Upvotes: 0

Views: 1031

Answers (2)

stevenl
stevenl

Reputation: 6798

While regex can do what you want, you may want to try the index function because that is specifically what the function is for and it is faster than regex. Use regex for more complex pattern matching.

if ( index( MYSTR, $rec_str ) != -1 ) {
    ....
}

Doing /^ $/ in the regex is to get an exact match. In that case, use eq:

if ( MYSTR eq $rec_str ) {
    ...
}

Upvotes: 2

Chankey Pathak
Chankey Pathak

Reputation: 21666

=~ is perfectly fine for this type of task.

If you want the exact match then use ^ and $ to match the start and end.

Demo

use constant {
MYSTR => "HGjfslT",
};
my $rec_str = "jfslT";
if (MYSTR =~ /$rec_str/){
     print "Matches!";
}
if (MYSTR =~ /^$rec_str$/){
     print "This will not match!";
}
$rec_str = "HGjfslT";
if (MYSTR =~ /^$rec_str$/){
     print "This will match!";
}

Upvotes: 0

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