Input vector. Either a character vector, or something
coercible to one.
replacement
Supply separate pattern and replacement strings
to vectorise over the patterns. References of the form 1,
2 will be replaced with the contents of the respective matched
group (created by ()) within the pattern.
For str_replace_all only, you can perform multiple patterns and
replacements to each string, by passing a named character to
pattern.
providing 
.