chickadee » srfi-130 » substring/cursors

These procedures return a string whose contents are the characters of s beginning with index start (inclusive) and ending with index end (exclusive). If substring/cursors produces the entire string, it may return either s or a copy of s; in some implementations, proper substrings may share memory with s. However, string-copy/cursors always returns a newly allocated string. They differ from the R7RS procedures substring and string-copy by accepting either cursors or indexes.