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Search Parameter Sharing Protocol for the X Window System
Notes
Regular expression searching is provided by many programs. Unfortunately, since there are so many dialects, it is not possible to make this part of the official protocol. Instead, specification of the dialect is covered by the provision for extended data, as described in the Technical Details section. This allows programs that use the same dialect to share the parameters. For other programs that do not understand the dialect, the user must translate the regular expression manually. (The regular expression should always be treated as any other search string, because this saves the user the trouble of copying it from one program to another.)
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