Replace returns with spaces and commas with semicolons?

Question

I want to be able to be able to replace all of the line returns (\n's) in a single string (not an entire file, just one string in the program) with spaces and all commas in the same string with semicolons.

Here is my code:

    $str =~ s/"\n"/" "/g;
    $str =~ s/","/";"/g;

Answer 1

This will do it. You don't need to use quotations around them.

$str =~ s/\n/ /g;
$str =~ s/,/;/g;

Explanation of modifier options for the Substitution Operator (s///)

e       Forces Perl to evaluate the replacement pattern as an expression. 
g       Replaces all occurrences of the pattern in the string. 
i       Ignores the case of characters in the string. 
m       Treats the string as multiple lines. 
o       Compiles the pattern only once. 
s       Treats the string as a single line. 
x       Lets you use extended regular expressions. 

Answer 2

You don't need to quote in your search and replace, only to represent a space in your first example (or you could just do / / too).

$str =~ s/\n/" "/g;
$str =~ s/,/;/g;