regcmp - regular expression compile
The regcmp command performs a function similar to
regcmp and, in most cases, precludes the need for calling
regcmp from C programs. Bypassing regcmp saves on both
execution time and program size. The command regcmp compiles the
regular expressions in filename and places the output in
filename.i.
−
If the − option is used, the output is
placed in filename.c. The format of entries in filename
is a name (C variable) followed by one or more blanks followed by one or more
regular expressions enclosed in double quotes. The output of regcmp is
C source code. Compiled regular expressions are represented as extern
char vectors. filename.i files may thus be #included
in C programs, or filename.c files may be compiled and later
loaded. In the C program that uses the regcmp output,
regex(abc,line) applies the regular expression named abc to
line. Diagnostics are self-explanatory.
Example 1 Examples of the regcmp command.
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"
The three arguments to telno shown above must all be
entered on one line.
In the C program that uses the regcmp output,
regex(telno, line, area, exch, rest)
applies the regular expression named telno to
line.
A general description of the usage of the LC_*
environmental variables can be found in environ(7).
LC_CTYPE
Determines how regcmp handles characters. When
LC_CTYPE is set to a valid value, regcmp can display and handle
text and filenames containing valid characters for that locale.
LC_MESSAGES
Determines how diagnostic and informative messages are
presented. This includes the language and style of the messages, and the
correct form of affirmative and negative responses. In the "C"
locale, the messages are presented in the default form found in the program
itself (in most cases, U.S. English).
See attributes(7) for descriptions of the following
attributes:
| ATTRIBUTE
TYPE |
ATTRIBUTE VALUE |
| CSI |
Enabled |