# If you'd like to omit non-matching lines from the result; add ';d' to the end of the expression.
sed -E 's/(?<!function )(?<!\\/\\/)print/\/\/$0/g;t' <<< "<?php
// Description of file
...
print(\"Foobar\");
// print(\"Foo\");
//print(\"bar\");
// Open and print file
function printtemplate($file) {
...
}
...
printtemplate($file);
...
?>"
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for SED, please visit: https://www.gnu.org/software/sed/manual/html_node/The-_0022s_0022-Command.html