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This is a page from Aba Search and Replace help file.

Alternative |

Alternative matches one of the specified patterns, which are separated by |.

(http|ftp):// http:// or ftp://
table|tr|td table, tr, or td
(https?|ftp):// http://, https://, or ftp://

You often have to use the parentheses for grouping, as is shown in the first example. Without parentheses, this example will be interpreted as “http or ftp://”.