Checks whether replacement is a valid replacement string (see replace),
i.
e. that all escape sequences in it are valid.
If has_references is not null then replacement is checked for pattern
references. For instance, replacement text 'foo\n' does not contain references and may be evaluated without information about actual
match, but '\0\1' (whole match followed by first subpattern) requires valid MatchInfo
object.
| replacement |
the replacement string |
| has_references |
location to store information about references in |
|
whether |