substring 554 Source/core/editing/TextIterator.cpp String TextIterator::substring(unsigned position, unsigned length) const substring 1710 Source/core/editing/TextIterator.cpp String WordAwareIterator::substring(unsigned position, unsigned length) const substring 472 Source/wtf/text/StringImpl.cpp PassRefPtr<StringImpl> StringImpl::substring(unsigned start, unsigned length) substring 345 Source/wtf/text/WTFString.cpp String String::substring(unsigned pos, unsigned len) const