(m4.info.gz) Index macro

 
 10.2 Searching for substrings
 =============================
 
 Searching for substrings is done with `index':
 
  -- Builtin: index (STRING, SUBSTRING)
      Expands to the index of the first occurrence of SUBSTRING in
      STRING.  The first character in STRING has index 0.  If SUBSTRING
      does not occur in STRING, `index' expands to `-1'.
 
      The macro `index' is recognized only with parameters.
 
      index(`gnus, gnats, and armadillos', `nat')
      =>7
      index(`gnus, gnats, and armadillos', `dag')
      =>-1
 
    Omitting SUBSTRING evokes a warning, but still produces output.
 
      index(`abc')
      error-->m4:stdin:1: Warning: too few arguments to builtin `index'
      =>0

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(m4.info.gz) Len

(m4.info.gz) Text handling

(m4.info.gz) Regexp

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