Injection regex is specified too broadly for tree-sitter-c grammar

[eugmes]

Summary

Injection regex is specified too broadly for tree-sitter-c grammar. It matches anything that contains letter 'c' in it.

Motivation

This behavior is confusing when one tries to add injection points for languages like ocaml (not possible right now anyway).

The current code is here:

language-c/grammars/tree-sitter-c.cson

Line 6 in af1e7f5

injectionRegex: 'c|C'

Perhaps it should better be changed to something like:

injectionRegex: '^(c|C)$'