Question

How i can Output \n OR \r OR \n\r IN Output of PHP Using “Regular Expression” ?

I know backlash should be double but I couldn’t do it.

My Code

preg_replace('/(\n|\r)/', '?', $String );

Answer 1

Just use str_replace() – You don’t need a regex:

$H = str_replace( "\n", '\n', $H);
$H = str_replace( "\r", '\r', $H);

Or as Mark points out, in one call:

$H = str_replace( array( "\n", "\r"), array( '\n', '\r'), $H);

Or, with two unnecessary regular expressions:

$H = preg_replace( "/\n/", '\n', $H);
$H = preg_replace( "/\r/", '\r', $H);

Or, one regular expression and some additional logic:

$H = preg_replace_callback( "/(\n|\r)/", function( $match) {
    return $match[1] == "\n" ? '\n' : '\r';
}, $H);