Subject: Re: [PATCH v5] userdiff: add builtin diff driver for kotlin language.

From: Jaydeep Das <[email-masked]>
Date: Thu, 10 Mar 2022 21:59:32 +0530

On 3/9/22 00:02, Johannes Sixt wrote:
> Am 08.03.22 um 17:54 schrieb [email-masked]:
>> So, the final regexes are these, right?:
> 
> Not quite.
> 
>>
>>       "[a-zA-Z_][a-zA-Z0-9_]*"
>>       /* hexadecimal and binary numbers */
>>       "|0[xXbB][0-9a-fA-F_]+[lLuU]*"
>>       /* integers and floats */
>>       "|[0-9][.]?[0-9_]+([Ee][-+]?[0-9]+)?[fFlLuU]*"
> 
> This would not match 12.5 because you allow only a single digit before
> the decimal point. Perhaps
> 
> 	"|[0-9][.0-9_]*([Ee][-+]?[0-9]+)?[fFlLuU]*"
> 

The problem with this approach is that it matches `2..5` as a single token.
However in Kotlin, `..` is used to specify a range so 2..5 should be broken into
2 .. and 5.