Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Regular expression are not the answer to <em>every</em> single problem. My advice would be to do something like:</p> <pre><code>boolean isValidSomethingOrOther (string): if string.length() != 4: return false for each character in string: if not character.isNumeric(): return false if string.toInt() &gt; 1331: return false return true </code></pre> <p>If you <em>must</em> use a regex, there's nothing wrong with your solution but I'd probably use the following variant (just based on my understanding of RE engines and how they work):</p> <pre><code>^0[0-9]{3}|1[0-2][0-9]{2}|13[0-2][0-9]|133[01]$ </code></pre> <ul> <li>The first section matches 0000-0999.</li> <li>The second matches 1000-1299.</li> <li>The third matches 1300-1329.</li> <li>The final one matches 1330 and 1331.</li> </ul> <p><em>Update:</em></p> <p>Just on the elegance comment, there are many forms of elegance of which regexes are one. You can also achieve elegance just by abstracting the validation out to a separate function or macro and then call it from your code:</p> <pre><code>if isValidSomethingOrOther(str) ... </code></pre> <p>where <code>SomethingOrOther</code> is a concrete business object. This allows you to change your idea of a valid object easily, even using a regex as you desire or any other checks you deem appropriate (such as my function above).</p> <p>This allows you to cater for any changes down the line such as the requirement that these object now have to be prime numbers.</p> <p>I'm sure I <em>could</em> write a "prime-number-less-than-1332" regex. I'm equally sure I wouldn't <em>want</em> to - I'd prefer to code that up as a function (or lookup table for raw speed), especially since the regex would most likely just look like:</p> <pre><code>^2|3|5|7| ... |1327$ </code></pre> <p>anyway.</p>
    singulars
    1. This table or related slice is empty.
    1. PORegex for fixed width field
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USpaxdiablo
    1. USpaxdiablo
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PORegex for fixed width field
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COI agree with you, but *in this particular case* they are much more elegant solution.
      singulars
      1. PO
      1. USLailson Bandeira
    2. COFair enough then: if you need to use an RE, then use it. It doesn't really matter how ugly it looks since you're going to document it right there in the code, just before it's specified, right? Or call the match string something intelligent, like reMatch0000Thru1331? :-)
      singulars
      1. PO
      1. USpaxdiablo
    3. COAs I said above, when I made this comment about elegance, I though I could write a simple regex to solve this problem, but now I'm going to match it with `\d{4}` and check the range when I make the capture with program code.
      singulars
      1. PO
      1. USLailson Bandeira
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload