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S( s. Search a text widget for the pattern.
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Return a tuple (lineno, matchobj); None if not found.
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The search starts at the selection (if there is one) or
at the insert mark (otherwise). If the search is forward,
it starts at the right of the selection; for a backward
search, it starts at the left end. An empty match exactly
at either end of the selection (or at the insert mark if
there is no selection) is ignored unless the ok flag is true
-- this is done to guarantee progress.
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original selection if (and only if) it is the only match.
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