Den 2013-09-06 00:29 skrev Jim Starkey såhär: > A couple of folks asked, so here it is. > > The scheme centers around pattern strings. A pattern string represents > one of any number of possible interpretations of a target string. A > pattern string consists of punctuation characters and the characters A > and 9 representing consecutive sequences of alphabetical characters or > digits. At initialization time, a hash table is generated containing > all possible legitimate target string patterns and respectiive rule codes. > > At decode time, a target string is scanned constructing a) its pattern > string and b) a vector of <address, length> of all alphabetic or numeric > sequences found. Since the max length of a legitimate pattern and the > maximum number of possible sequences, these can be statically allocated. > > Some sample string and corresponding patterns: > > 9/5/2013 9/9/9 with segments 9 5 2013 > 5.9.13 9.9.9 with segments 5 9 13 > September 5, 2013 A9,9 with segments September 5 2013 > > After a target string is scanned the hash table is checked for a > matching pattern rule. If found, resulting the rule is used as the > argument for a case statement to apply the rule to the vector of segments. > > There is usually a little more work to be done. For dates, for example, > it is necessary to validate day and month, look up alphabetic months, > and expand two digit years, etc.
Nice idea. What if there are multiple format strings that match the decoded pattern? E.g. these formats will look alike: yy-mm-dd mm-dd-yy dd-mm-yy All of these are in active use in various parts of the world. Throw an error? Use some priority order? Based on... what? Regards, Kjell -- -------------------------------------- Kjell Rilbe DataDIA AB E-post: kj...@datadia.se Telefon: 08-761 06 55 Mobil: 0733-44 24 64 ------------------------------------------------------------------------------ Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
