Digit « Regular Expression « Perl

1.Determine if a string has a digit.
2.Check for no digit
3.Check for digit
4.if ($text =~ /(\d+)/) {print "Here's the number of apples: $1.\n";}
5.if ($text =~ /\D/) {print "It's not a number.";}
6.if ($text =~ /^[+-]\d+\.\d*$/) {print "It's a number.";}
7.if ($text =~ /^\d+$/) {print "It's a number.";}
8.A simple integer-validation program.
9.Get all numbers

10.Match the one or more alphanumerics.
11.Match numbers
12.Matching Any Letter or Number
13.Match one or zero alphanumerics followed by a single space character