sed script, multi-line replace

We're in need of a sed script to do the following: Take an input file (see below for sample file) Replace: \begin{tabular}{|l|l|l|} with \begin{tabular}{|l|r|r|} Delete all instances of the following patterns: Pattern 1: 0&0&0\ \hline Pattern 2: \colorrow 0&0&0\ \hline Pattern 3: 0&&\ \hline Pattern 4: \colorrow 0&&\ \hline And save the result to another file. Sed only please (yes, you can do it with AWK, thank you) If you know what you're doing this shouldn't take too long at all. Sample file: \def\colorrow{\rowcolor[gray]{0.50}} \begin{tabular}{|l|l|l|} \colorrow Email features&5&4\ \hline Anonymous user support&5&5\ \hline \colorrow Survey response&5&4\ \hline Admin survey response report&8&5\ \hline 0&0&0\ \hline \colorrow 0&0&0\ \hline 0&0&0\ \hline \colorrow 0&0&0\ \hline 0&0&0\ \hline \colorrow 0&0&0\ \hline 0&0&0\ \hline \colorrow 0&0&0\ \hline 0&0&0\ \hline \colorrow 0&0&0\ \hline 0&&\ \hline \colorrow 0&&\ \hline 0&&\ \hline \colorrow \textbf{Total}&123&\ \hline \end{tabular}