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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.

string-index s char_pred [start end] Scheme Procedure
string-index-right s char_pred [start end] Scheme Procedure
Search through the string s from left to right (right to left), returning the index of the first (last) occurrence of a character which
  • equals char_pred, if it is character,
  • satisfies the predicate char_pred, if it is a procedure,
  • is in the set char_pred, if it is a character set.

string-skip s char_pred [start end] Scheme Procedure
string-skip-right s char_pred [start end] Scheme Procedure
Search through the string s from left to right (right to left), returning the index of the first (last) occurrence of a character which
  • does not equal char_pred, if it is character,
  • does not satisfy the predicate char_pred, if it is a procedure.
  • is not in the set if char_pred is a character set.

string-count s char_pred [start end] Scheme Procedure
Return the count of the number of characters in the string s which
  • equals char_pred, if it is character,
  • satisfies the predicate char_pred, if it is a procedure.
  • is in the set char_pred, if it is a character set.

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

string-contains-ci is the case-insensitive variant.