(guile.info.gz) String Comparison

(guile.info.gz) String Modification
 
 21.4.7 String Comparison
 ------------------------
 
 The procedures in this section are similar to the character ordering
 predicates ( Characters), but are defined on character sequences.
 They all return `#t' on success and `#f' on failure.  The predicates
 ending in `-ci' ignore the character case when comparing strings.
 
  -- Scheme Procedure: string=? s1 s2
      Lexicographic equality predicate; return `#t' if the two strings
      are the same length and contain the same characters in the same
      positions, otherwise return `#f'.
 
      The procedure `string-ci=?' treats upper and lower case letters as
      though they were the same character, but `string=?' treats upper
      and lower case as distinct characters.
 
  -- Scheme Procedure: string<? s1 s2
      Lexicographic ordering predicate; return `#t' if S1 is
      lexicographically less than S2.
 
  -- Scheme Procedure: string<=? s1 s2
      Lexicographic ordering predicate; return `#t' if S1 is
      lexicographically less than or equal to S2.
 
  -- Scheme Procedure: string>? s1 s2
      Lexicographic ordering predicate; return `#t' if S1 is
      lexicographically greater than S2.
 
  -- Scheme Procedure: string>=? s1 s2
      Lexicographic ordering predicate; return `#t' if S1 is
      lexicographically greater than or equal to S2.
 
  -- Scheme Procedure: string-ci=? s1 s2
      Case-insensitive string equality predicate; return `#t' if the two
      strings are the same length and their component characters match
      (ignoring case) at each position; otherwise return `#f'.
 
  -- Scheme Procedure: string-ci<? s1 s2
      Case insensitive lexicographic ordering predicate; return `#t' if
      S1 is lexicographically less than S2 regardless of case.
 
  -- Scheme Procedure: string-ci<=? s1 s2
      Case insensitive lexicographic ordering predicate; return `#t' if
      S1 is lexicographically less than or equal to S2 regardless of
      case.
 
  -- Scheme Procedure: string-ci>? s1 s2
      Case insensitive lexicographic ordering predicate; return `#t' if
      S1 is lexicographically greater than S2 regardless of case.
 
  -- Scheme Procedure: string-ci>=? s1 s2
      Case insensitive lexicographic ordering predicate; return `#t' if
      S1 is lexicographically greater than or equal to S2 regardless of
      case.
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