With the EndString set to "apro":

    "apro"      will match;
    "aapro"     will not match, but "a apro"     will match;
    "apapro"    will not match, but "ap apro"    will match;
    "aprapro"   will not match, but "apr apro"   will match;
    "aproapro"  will match (twice).