* compare if two sub-strings are equal * \param[in] str1 string pattern to search * \param[in] str2 text in which to search * \param[in] start1,end1 start and end indices for substring in str1 * \param[in] start2,end2 start and end indices for substring in str2 * \returns `true` if pattern was found * \returns `false` if pattern was not found * @note can this be replaced by std::string::com
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