regcmp(1)
NAME
regcmp − regular expression compile
SYNTAX
regcmp [ − ] files
DESCRIPTION
The regcmp command, in most cases, precludes the need for calling regcmp(3x) from C programs. This saves on both execution time and program size. The regcmp command compiles the regular 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 variable, 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 into 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.