isWordStartMatch   91 Source/core/editing/TextIterator.cpp     bool isWordStartMatch(size_t start, size_t length) const;
isWordStartMatch 2015 Source/core/editing/TextIterator.cpp     if (isBadMatch(m_buffer.data() + matchStart, matchedLength) || ((m_options & AtWordStarts) && !isWordStartMatch(matchStart, matchedLength))) {