To convert the markdown italic text $script
into html, I've written this:
my $script = "*so what*";
my $res =~ s/\*(.)\*/$1/g;
print "<em>$1</em>\n";
The expected result is:
<em>so what</em>
but it gives:
<em></em>
How to make it give the expected result?
CodePudding user response:
Problems:
- You print the wrong variable.
- You switch variable names halfway through.
.
won't match more than one character.- You always add one EM element, even if no stars are found.
- You always add one EM element, even if multiple pairs of stars are found.
- You add the EM element around the entire output, not just the portion in stars.
Fix:
$script =~ s{\*([^*] )\*}{<em>$1</em>}g;
print "$script\n";
or
my $res = $script =~ s{\*([^*] )\*}{<em>$1</em>}gr;
print "$res\n";
But that's not it. Even with all the aforementioned problems fixed, your parser still has numerous other bugs. For example, it misapplies italics for all of the following:
**Important**
Correct: Important
Your code: *Important*4 * 5 * 6 = 120
Correct: 4 * 5 * 6 = 120
Your code: 4 5 6 = 1204 * 6 = 20 is *wrong*
Correct: 4 * 6 = 20 is wrong
Your code: 4 6 = 20 is wrong*`foo *bar* baz`
Correct:foo *bar* baz
Your code: `foo bar baz`\*I like stars\*
Correct: *I like stars*
Your code: \I like stars\