Presumably you want to do this to avoid suid script restrictions. Here are a couple of options.

#!/usr/bin/perl
die Usage: ldap-group [-p] trans \n" unless @ARGV;
for my $arg(@ARGV) {
    die "Invalid $arg\n" unless $arg =~ m/^[A-Za-z]+$/;
}
exec("/opt/bin/techweb-changes.pl",@ARGV);
[download]

To do it in C it would be easiest to use a regex library

#include <regex.h>

/*
 * Match string against the extended regular expression in
 * pattern, treating errors as no match.
 *
 * return 1 for match, 0 for no match
 */

int
match(const char *string, char *pattern)
{
    int    status;
    regex_t    re;

    if (regcomp(&re, pattern, REG_EXTENDED|REG_NOSUB) != 0) {
        return(0);      /* report error */
    }
    status = regexec(&re, string, (size_t) 0, NULL, 0);
    regfree(&re);
    if (status != 0) {
        return(0);      /* report error */
    }
    return(1);
}
[download]

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