On 3/9/22 00:02, Johannes Sixt wrote:

Am 08.03.22 um 17:54 schrieb jaydeepjd.8914@gmail.com:

quoted

So, the final regexes are these, right?:

Not quite.

quoted

      "[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.