test() doesn't check that frontmatter is at the front

[jgclark]

You describe frontmatter in the way that I understand it: it must come at the top of a file.

However, test() doesn't check that the YAML block comes at the start of the passed string:

front-matter/index.js

Line 79 in 71f4ea0

return regex.test(string)

because regex isn't defined as being at the start of the string:

front-matter/index.js

Lines 4 to 11 in 71f4ea0

	var pattern = '^(' +
	optionalByteOrderMark +
	'(= yaml =|---)' +
	'$([\\s\\S]*?)' +
	'^(?:\\2|\\.\\.\\.)\\s*' +
	'$' +
	(platform === 'win32' ? '\\r?' : '') +
	'(?:\\n)?)'

Please either change test() to respect this constraint, or allow an extra parameter to be passed that defines whether this constraint is respected or not.