StringPosition["string", "sub"] gives a list of the starting and ending character positions at which "sub" appears as a substring of "string".
StringPosition["string", "sub", k] includes only the first k occurrences of "sub".
StringPosition["string", "", "", ... ] gives positions of all the "".
Example: StringPosition["abbaabbaa", "bb"] .
With the default option setting Overlaps -> True, StringPosition includes substrings that overlap. With the setting Overlaps -> False such substrings are excluded.
Setting the option IgnoreCase -> True makes StringPosition treat lower- and upper-case letters as equivalent.
Example: StringPosition["abAB", "a", IgnoreCase -> True] .
StringPosition returns sequence specifications in the form used by StringTake, StringDrop and StringReplacePart.
See The Mathematica Book: Section 2.7.2.
See also: Position, Characters, FindList, ReplaceList.
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