text: public virtual int FindStartOffset(StringBuilder buffer, int start){if (start > buffer.Length || start < 1) return start;int offset, count = m_maxScan;for (offset = start; offset > 0 && count > 0; count--){if (m_boundaryChars.Contains(buffer[offset - 1])) return offset;offset--;}if (offset == 0){return 0;}return start;}