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Regexp(3I)

NAME

   Regexp - regular expression searching

SYNOPSIS

   #include <InterViews/regexp.h>

DESCRIPTION

   A   Regexp  encapsulates  a  regular  expression  pattern  and  defines
   operations for searching and matching the  pattern  against  a  string.
   The  syntax  of  the regular expression pattern is the same as that for
   ed(1).  Information can be obtained about the most recent match of  the
   regular expression (and its sub-expressions).

PUBLIC OPERATIONS

   Regexp(const char* pattern)
   Regexp(const char* pattern, int length)
          Construct a new Regexp for pattern.

   int Match(const char* text, int length, int index)
          Attempt  a  match  against  text  (of length length) at position
          index.  The return value is the length of the  matching  string,
          or a negative number if the match failed.

   int Search(const char* text, int length, int index, int range)
          Search  for  a  match  in  the  string  text (of length length).
          Matches are attempted starting at positions  between  index  and
          index  plus  range.   If range is positive the first match after
          index is reported.  If range is negative the first match  before
          index  is  reported.   The  return  value  is  the  index of the
          starting position of the match, or a negative number if there is
          no match in the specified range.

   int BeginningOfMatch(int subexp)
   int EndOfMatch(int subexp)
          Return  information  about  the most recent match.  If subexp is
          zero (the default), information is  reported  for  the  complete
          regular  expression.   Other  values  of  subexp  refer  to sub-
          expressions in the  pattern.   For  example,  if  subexp  is  2,
          information  is returned for the sub-expression specified by the
          second pair of \( and \) delimiters in the pattern.

SEE ALSO

   ed(1)



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