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$ perl -E' print "Enter a number or string: "; my $s = <STDIN>; chomp $s; if ( $s =~ /^[0-9,.E]+$/ ) { say "$s is a number\n"; } else { say "$s may be a string\n"; } ' Enter a number or string: ,,, ,,, is a number $ perl -E' print "Enter a number or string: "; my $s = <STDIN>; chomp $s; if ( $s =~ /^[0-9,.E]+$/ ) { say "$s is a number\n"; } else { say "$s may be a string\n"; } ' Enter a number or string: EEE EEE is a number $ perl -E' print "Enter a number or string: "; my $s = <STDIN>; chomp $s; if ( $s =~ /^[0-9,.E]+$/ ) { say "$s is a number\n"; } else { say "$s may be a string\n"; } ' Enter a number or string: -777 -777 may be a string

If you are going to use a regular expression then you should probably read the FAQ: How do I determine whether a scalar is a number/whole/integer/float?


In reply to Re^2: A function to determine if a string is numeric by jwkrahn
in thread A function to determine if a string is numeric by juliosergio

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