public static String guessPDBID(String name) {
		Matcher match = PDBID_REGEX.matcher(name);
		if(match.matches()) {
			return match.group(1).toUpperCase();
		} else {
			// Give up if doesn't match
			return null;
		}
	}
public static String guessPDBID ( String name ) { Matcher match = PDBID_REGEX . matcher ( name ) ; if ( match . matches ( ) ) { return match . group ( 1 ) . toUpperCase ( ) ; } else { return null ; } }
Recognizes PDB IDs that occur at the beginning of name followed by some
delimiter.
@param name Input filename
@return A 4-character id-like string, or null if none is found