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Function std.string.succ
Return string that is the 'successor' to s[].
If the rightmost character is a-zA-Z0-9, it is incremented within
its case or digits. If it generates a carry, the process is
repeated with the one to its immediate left.
Prototype
S succ(S)( S s ) pure @safe if (isSomeString!S);
Example
assert(succ("1") == "2");
assert(succ("9") == "10");
assert(succ("999") == "1000");
assert(succ("zz99") == "aaa00");
Authors
Walter Bright, Andrei Alexandrescu, and Jonathan M Davis