extract particular pattern from a file in shell scripting

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http://stackoverflow.com – I try to extract a particular pattern from a file. the file content: --------some other command in here---------- <tr> <td>someWords</td> <td>anotherWords</td> </tr> --------some other command in here----------- the <tr>...</tr> patter occur again I try to extract the tr pattern from the file in the shell script I write: read INPUT grep '<tr>\n<td>[A-Za-z0-9,<,>,/]</td>\n<td>[A-Za-z0-9,<,>,/]</td>\n</tr> However, this command doesnt work. Any idea? thx (HowTos)