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Epsilon User's Manual and Reference >
Command Reference >
keep-matching-lines
Delete all lines but those containing a regex pattern.
This command prompts for a regular expression pattern. It then
deletes all lines below point in the current buffer except those that
contain the pattern. While you type the pattern, Ctrl-W enables or
disables word searching, restricting matches to complete words.
Ctrl-T enables or disables regular expression searching, in which the
search string specifies a pattern (see regex-search for rules).
Ctrl-C enables or disables case-folding.
More info:
Replacing
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