I see, looks nice.
I do get the error message twice, because of [this](https://github.com/D-Programming-Language/phobos/blob/22b2a267e86559525f7c76ae5ee9985328102a29/std/regex.d#L940).
```
std.regex.RegexException@DPL/dmd/src/../../phobos/std/regex.d(1983): Illegal {n,m} quantifier
Pattern with error: `fooa{1,0}` <--HERE-- `bar`
Pattern with error: `fooa{1,0}` <--HERE-- `bar`
```