tr

C1[] tr(C1,  C2,  C3,  C4 =  immutable  char)(C1[]  str,  const(C2)[]  from,  const(C3)[]  to,  const(C4)[]  modifiers =  null)

Replaces the characters in str which are in from with the the corresponding characters in to and returns the resulting string.

tr is based on

though it doesn't do everything that the Posix utility does.

`str`	The original string.
`from`	The characters to replace.
`to`	The characters to replace with.
`modifiers`	String containing modifiers. Modifiers: If the modifier `'d'` is present, then the number of characters in `to` may be only `0` or `1`. If the modifier `'d'` is not present, and `to` is empty, then `to` is taken to be the same as `from`. If the modifier `'d'` is not present, and `to` is shorter than `from`, then `to` is extended by replicating the last character in `to`. Both `from` and `to` may contain ranges using the `'-'` character (e.g. `"a-d"` is synonymous with `"abcd"`.) Neither accept a leading `'^'` as meaning the complement of the string (use the `'c'` modifier for that).