71 lines
1.7 KiB
C++
71 lines
1.7 KiB
C++
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#include <sys/types.h>
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#include <regex.h>
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#include <stdio.h>
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#include <stdlib.h>
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const char * usage = ""
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"Usage:\n"
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" regular regular-expresion string\n"
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"\n"
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" Tells if \"string\" matches \"regular-expresion\".\n"
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"\n"
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" '^' and '$' characters are added at the beginning and\n"
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" end of \"regular-expresion\" to force match of the entire\n"
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" \"string\"\n"
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"\n"
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" To know more about regular expresions type \"man ed\"\n"
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"Try:\n"
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" bash> ./regular aaa aaa\n"
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" bash> ./regular \"a*\" aaaa\n"
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" bash> ./regular \"a*\" aaa\n"
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" bash> ./regular \"a*\" aaaf\n"
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" bash> ./regular \"a.*\" akjhkljh \n"
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" bash> ./regular \"a.*\" jkjhkj\n"
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" bash> ./regular \"a.*\" aaalklkjlk\n"
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" bash> ./regular \".*\\..*\" kljhkljhlj.lkjhlkj\n"
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" bash> ./regular \".*\\..*\" kljhkljhlj\n\n";
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int
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main(int argc, char ** argv)
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{
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if ( argc < 3 ) {
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fprintf( stderr, "%s", usage );
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exit( -1 );
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}
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const char * regularExp = argv[1];
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const char * stringToMatch = argv[2];
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/*
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* Add ^ and $ at the beginning and end of regular expression
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* to force match of the entire string. See "man ed".
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*/
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char regExpComplete[ 1024 ];
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sprintf(regExpComplete, "^%s$", regularExp );
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regex_t re;
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int result = regcomp( &re, regExpComplete, REG_EXTENDED|REG_NOSUB);
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if( result != 0 ) {
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fprintf( stderr, "%s: Bad regular expresion \"%s\"\n",
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argv[ 0 ], regExpComplete );
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exit( -1 );
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}
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regmatch_t match;
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result = regexec( &re, stringToMatch, 1, &match, 0 );
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const char * matchResult = "MATCHES";
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if ( result != 0 ) {
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matchResult = "DOES NOT MATCH";
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}
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fprintf( stderr, "\t\"%s\" %s \"%s\"\n", matchResult,
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regExpComplete, stringToMatch);
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regfree(&re);
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return 0;
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}
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