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The result of the expression
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$string =~ m/$regex/
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is true if and only if the value of $string matches $regex.
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For example,
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if ( <STDIN> =~ m/^[Tt][Oo]:/ ) { ... }
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matches if current input line starts with to: (any case)
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Note: m/^to:/i is equivalent to above expression since modifier /i instructs pattern matcher to ignore case
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Any delimiter may be used in place of the slash
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m%^[Tt][Oo]:% # equivalent to previous expression
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The m operator may be omitted, but then slash delimiters are required
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