($this_mail) and ($this_in) are variable isn't it? but than i didn't see it has been defined in the code? how does it possible?
what does the /gio means? , whats the function?
($this_mail) = ($this_in =~ /(.*)/gio)
Re^3: Can someone help me to explain the code below
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You should first check out the perl documentation, where you'll find links to the answers to your questions (start with the Overview and Tutorials sections), e.g. $ does preceed scalar variables (see perldata), and variables are defined as you use them (although you are strongly encouraged to Use strict and warnings, "/gio" is actually part of "=~" with "//" (with the g,i, and o options) which is the pattern match operator (see perlop and perlre), All of these docs can be displayed at the command line with perldoc, e.g. "perldoc perl" or "perldoc perlre".