XmlIncrementalLexer.startsWithAt

bool startsWithAt(string needle, size_t fromReadPos) const @safe pure nothrow

Returns true if at least needle.length unread bytes starting at the given offset match needle.

`needle`	String to match against.
`fromReadPos`	Offset relative to the current read position (0 = current byte).

true if needle matches at the specified position and enough data is available.