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Rev

\$\begingroup\$ The second option doesn't work because the engine doesn't backtrack into 0-length groups (an annoying optimization). You could use ^((1+) )+(\2?(?<-2>)|){99}$ (34 bytes, with limit on number of coins), or ^((1+) |1+ )+(\2?(?<-2>))+$ (also 34 bytes). \$\endgroup\$

Kobi
– Kobi

2017-05-09 05:08:59 +00:00
Commented May 9, 2017 at 5:08
1

\$\begingroup\$ @Kobi Beautiful! I saved 2 bytes from both answers because I forgot that (?<-2>\2?) works, plus a further byte from your second answer because the ? is no longer necessary. \$\endgroup\$

Neil
– Neil

2017-05-09 08:58:06 +00:00
Commented May 9, 2017 at 8:58

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create code fences with backticks ` or tildes ~
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like so
```
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def function(foo):
print(foo)
```
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