doc faq: Mention (?S)
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@ -269,6 +269,9 @@ order to select data in a line without any trailing newline characters, one coul
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use the `[^\n]+` pattern, which is arguably a good compromise when
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balanced against the ability to select data over several lines.
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You can instruct the regex engine to stop matching newline characters with
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`.` by disabling the appropriate flag (`(?S)`).
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=== Why does `a` extend the current selection, but `i` leaves it untouched ?
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Selections are ranges of characters whose delimiters are an "anchor" and
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