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We have finally finished study of regular expressions and have illustrated this for substitution operator (s) acting on default variable $_. We can generalize this operation in many ways
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The result of ( Variable Name =~ /Regular Expression/ ) is true if and only if value of Variable Name matches Regular Expression. For example
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if ( <STDIN> =~ /^(T|t)(O|o):/ ) { # <STDIN> is $_
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..; # Process to: field of mail } # matches if current input
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line contains to: with any case at start of line
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There is an implied match operator above which we can make explicit with m
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$line =~ m/^(T|t)(O|o):/ and we can use m to change delimiter from / to any character and
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$line =~ m%^(T|t)(O|o):% # is equivalent to previous statement
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Note m/^to:/i equivalent to above as modifier i instructs pattern match to ignore case
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