One of the problem is your use of % in Perl. In your SQL example, % is a wild card, but not in Perl though. The Perl version does not seem to be correct. Get rid of that % in the regexp.

SQL does a head-to-tail match (it matches the entire string) and that is why you need that % at the end. But Perl regexp does not work in that way, it can match a portion of the string.

For example, SQL 'like abc%' is close to Perl's '/^abc.*$/. But in your case, if DDD always appears at the beginning, there is no need to use ^ or $.

Your second regexp could be as simple as /DDD_t/, or /^DDD_t/.

For your last two regexp's, you can use substr() just like the SQL version does.

In reply to Re: SQL and Perl comparison by pg
in thread SQL and Perl comparison by Win

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.