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Matching - Grouping << Matching - Extras >> Search & Replace
The examples thus far have shown matches that are case sensitive. That is, it matters if there is a capital or lower case letter. To turn off case sensitivity, add an i after the last forward slash of the expression. The i stands for insensitive.

$string =~ /test/i;

Now the expression will hold true for test, Test, TEST, TesT, etc..



Normally a match search is ended after the first occurance is found. There may be times when you want to find all occurances of an element within a string. Using g and a loop, this can be done. The g stands for global. Another feature to bring in is the $&. This is a special built-in variable that holds the value of the last triggered match.

$string1="This is an example string that will trigger several matches.";
print "String1 contains $string1 \n";
while ($string1 =~ /[a-z]+/gi){
print "A match was made with $& \n";
}

The while block executes as long as there is a match in $string1. The print line uses the built-in variable which always contains the string that triggered the most recent match.

Here is the same script using an array instead of a loop.

$string1="This is an example string that will trigger several matches.";
@results = $string1 =~ /[a-z]+/gi;
print "@results \n";
Matching - Grouping << Matching - Extras >> Search & Replace
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