Node:String Searching, Next:Alphabetic Case Mapping, Previous:String Comparison, Up:Strings
When searching for the index of a character in a string, these procedures can be used.
| string-index str chr [frm [to]] | Scheme Procedure |
| scm_string_index (str, chr, frm, to) | C Function |
Return the index of the first occurrence of chr in
str. The optional integer arguments frm and
to limit the search to a portion of the string. This
procedure essentially implements the index or
strchr functions from the C library.
(string-index "weiner" #\e) => 1 (string-index "weiner" #\e 2) => 4 (string-index "weiner" #\e 2 4) => #f |
| string-rindex str chr [frm [to]] | Scheme Procedure |
| scm_string_rindex (str, chr, frm, to) | C Function |
Like string-index, but search from the right of the
string rather than from the left. This procedure essentially
implements the rindex or strrchr functions from
the C library.
(string-rindex "weiner" #\e) => 4 (string-rindex "weiner" #\e 2 4) => #f (string-rindex "weiner" #\e 2 5) => 4 |