String DATE_FORMAT = "yyyyMMdd";
try {
    DateFormat dfyyyyMMdd = new SimpleDateFormat(DATE_FORMAT);
    dfyyyyMMdd.setLenient(false);
    Date formattedDate;
    formattedDate = dfyyyyMMdd.parse(aValue);
    console.debug(String.format("%s = %s","formattedDate",formattedDate));
} catch (ParseException e) {
    // Not a date
}

ParsePosition pos = new ParsePosition(0);
dfyyyyMMdd.parse(aValue, pos);
if (pos.getIndex() != aValue.length()) {
    // there's garbage at the end
}

public Date parse(String source)
               throws ParseException

    Parses text from the beginning of the given string to produce a date.
    The method may not use the entire text of the given string.

yyyyMMdd(followed by anything)

"10000514blabla" --> Tue May 14 00:00:00 EST 1000
"100 112"        --> Sun Jan 12 00:00:00 EST 100
"1 112xyz"       --> Wed Jan 12 00:00:00 EST 1