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21.4.5 String Selection

Portions of strings can be extracted by these procedures. string-ref delivers individual characters whereas substring can be used to extract substrings from longer strings.

string-length string Scheme Procedure
scm_string_length (string) C Function
Return the number of characters in string.

string-ref str k Scheme Procedure
scm_string_ref (str, k) C Function
Return character k of str using zero-origin indexing. k must be a valid index of str.

string-copy str Scheme Procedure
scm_string_copy (str) C Function
Return a newly allocated copy of the given string.

substring str start [end] Scheme Procedure
scm_substring (str, start, end) C Function
Return a newly allocated string formed from the characters of str beginning with index start (inclusive) and ending with index end (exclusive). str must be a string, start and end must be exact integers satisfying:

0 <= start <= end <= (string-length str).