hq doesn't accept underscores in key names

[fotonick]

hq doesn't accept underscores in the key names. This is surprising to me and the generic error message didn't make this limitation easy to find.

Example:

❯ echo '<div class="a">test</div>' | hq '{ a: .a }'
{"a":"test"}
❯ echo '<div class="a">test</div>' | hq '{ a_text: .a }'
Error parsing:
0: at line 1:
{ a_text: .a }
  ^
expected '}', found a

If I'm not mistaken, it's from the use of alphanumeric1 in the parsing function. Is underscore support something you would add? If it helps, there's a Stack Overflow answer that seems to have exactly the nom parser combinator invocations you need.

[orf]

Closed by #147