Escapes the nul characters in string to "\x00". It can be used
to compile a regex with embedded nul characters.
For completeness, length can be -1 for a nul-terminated string.
In this case the output string will be of course equal to string.
Since 2.30
Escapes the nul characters in string to "\x00". It can be used to compile a regex with embedded nul characters. For completeness, length can be -1 for a nul-terminated string. In this case the output string will be of course equal to string. Since 2.30