SRFI-13 Searching - Guile Reference Manual

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39.11.9 Searching

Use these procedures to find out whether a string contains a given character or a given substring, or a character from a set of characters.

— Scheme Procedure: string-index s char_pred [start [end]]

Search through the string s from left to right, returning the index of the first occurence of a character which

equals char_pred, if it is character,
satisifies the predicate char_pred, if it is a procedure,
is in the set char_pred, if it is a character set.

— Scheme Procedure: string-skip s char_pred [start [end]]
— Scheme Procedure: string-skip-right s char_pred [start [end]]

Search through the string s from left to right, returning the index of the first occurence of a character which

does not equal char_pred, if it is character,
does not satisify the predicate char_pred, if it is a procedure,
is not in the set if char_pred is a character set.

— Scheme Procedure: string-count s char_pred [start [end]]

Return the count of the number of characters in the string s which

equals char_pred, if it is character,
satisifies the predicate char_pred, if it is a procedure.
is in the set char_pred, if it is a character set.

— Scheme Procedure: string-contains s1 s2 [start1 [end1 [start2 [end2]]]]
— Scheme Procedure: string-contains-ci s1 s2 [start1 [end1 [start2 [end2]]]]

Does string s1 contain string s2? Return the index in s1 where s2 occurs as a substring, or false. The optional start/end indices restrict the operation to the indicated substrings.