03-31-2013
I disagree with the previous responses. There's definitely a way to do it. Took me just a few seconds to "get it", at least one way. And it's not a "trick question". This is a very good question your professor asked.
My understanding is I'm not supposed to just give the answer.
![Big Grin Smilie](https://www.unix.com/images/smilies/biggrin.gif)
I'm sure you can figure it out if you understand regular expressions. Do you understand regular expressions?
I'll give a clue. The regular expression is relatively short.
Before you try to solve the problem, your first step should be to build a test file to confirm if your solution works or not. Could you provide the test file?
This User Gave Thanks to hanson44 For This Post:
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LEARN ABOUT SUNOS
re_comp
re_comp(3C) Standard C Library Functions re_comp(3C)
NAME
re_comp, re_exec - compile and execute regular expressions
SYNOPSIS
#include <re_comp.h>
char *re_comp(const char *string);
int re_exec(const char *string);
DESCRIPTION
The re_comp() function converts a regular expression string (RE) into an internal form suitable for pattern matching. The re_exec() func-
tion compares the string pointed to by the string argument with the last regular expression passed to re_comp().
If re_comp() is called with a null pointer argument, the current regular expression remains unchanged.
Strings passed to both re_comp() and re_exec() must be terminated by a null byte, and may include NEWLINE characters.
The re_comp() and re_exec() functions support simple regular expressions, which are defined on the regexp(5) manual page. The regular
expressions of the form {m}, {m,}, or {m,n} are not supported.
RETURN VALUES
The re_comp() function returns a null pointer when the string pointed to by the string argument is successfully converted. Otherwise, a
pointer to one of the following error message strings is returned:
No previous regular expression
Regular expression too long
unmatched (
missing ]
too many () pairs
unmatched )
Upon successful completion, re_exec() returns 1 if string matches the last compiled regular expression. Otherwise, re_exec() returns 0 if
string fails to match the last compiled regular expression, and -1 if the compiled regular expression is invalid (indicating an internal
error).
ERRORS
No errors are defined.
USAGE
For portability to implementations conforming to X/Open standards prior to SUS, regcomp(3C) and regexec(3C) are preferred to these func-
tions. See standards(5).
SEE ALSO
grep(1), regcmp(1), regcmp(3C), regcomp(3C), regexec(3C), regexpr(3GEN), regexp(5), standards(5)
SunOS 5.10 26 Feb 1997 re_comp(3C)