REGCMP(1-SysV)      RISC/os Reference Manual       REGCMP(1-SysV)



NAME
     regcmp - regular expression compile

SYNOPSIS
     regcmp [ - ] files

DESCRIPTION
     The regcmp command performs a function similar to regcmp(3X)
     and, in most cases, precludes the need for calling
     regcmp(3X) from C programs.  This saves on both execution
     time and program size.  The command regcmp compiles the reg-
     ular expressions in file and places the output in file.i.
     If the - option is used, the output will be placed in
     file.c.  The format of entries in file is a name (C vari-
     able) followed by one or more blanks followed by a regular
     expression enclosed in double quotes.  The output of regcmp
     is C source code.  Compiled regular expressions are
     represented as extern char vectors.  file.i files may thus
     be included in C programs, or file.c files may be compiled
     and later loaded.  In the C program which uses the regcmp
     output, regex(abc,line) will apply the regular expression
     named abc to line.  Diagnostics are self-explanatory.

EXAMPLES
     name     "([A-Za-z][A-Za-z0-9_]*)$0"

     telno    "\({0,1}([2-9][01][1-9])$0\){0,1} *"
              "([2-9][0-9]{2})$1[ -]{0,1}"
              "([0-9]{4})$2"

     In the C program that uses the regcmp output,

          regex(telno, line, area, exch, rest)

          will apply the regular expression named telno to line.

SEE ALSO
     regcmp(3X).

















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