Databases
StackOverflow2013
Postsdbo
PORegEx to tell if a string does not contain a specific character
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PORegEx to tell if a string does not contain a specific character
    primarykey
    data
    text
    <p>Easy question this time.</p> <p>I'm trying to test whether or not a string does not contain a character using regular expressions. I thought the expression was of the form "[^<em>x</em>]" where <em>x</em> is the character that you don't want to appear, but that doesn't seem to be working.</p> <p>For example,</p> <pre><code>Regex.IsMatch("103","[^0]") </code></pre> <p>and</p> <pre><code>Regex.IsMatch("103&amp;","[^&amp;]") </code></pre> <p>both return true (I would expect false).</p> <p>I started using <code>"[^&amp;]"</code> and thought maybe the &amp; needed to be escaped as \&amp;, but it didn't seem to make a difference.</p> <p>Ideas? I assume it's something small.</p> <p>Also, I'm using .NET, so keep that in mind.</p> <p>Edit1:</p> <p>I found <a href="https://stackoverflow.com/questions/42990/regex-to-match-against-something-that-is-not-a-specific-substring">this</a>, but it doesn't seem to answer the issue I'm having.</p> <p>Edit2:</p> <p>I wanted to respond to <a href="https://stackoverflow.com/questions/198781/regex-to-tell-if-a-string-does-not-contain-a-specific-character#198793">Kevin</a> and <a href="https://stackoverflow.com/questions/198781/regex-to-tell-if-a-string-does-not-contain-a-specific-character#198796">Joel</a>'s suggestions. These suggestions would indeed be faster, but they don't accomplish the flexibility I need in this case, so if you found this question through search, definitely look to see if their answers will fit your needs. In my case, the regular expression is getting passed in to a DataTable validation method that loops through each row and verifies that the contents of that row in a specific column matches the RegEx that is getting passed in. Since I'll be reusing this method for several other DataTables that are being validated, I wanted to:</p> <ol> <li>Use Regex to enable the widest range of validations, and</li> <li>Always look for a positive match (i.e. instead of using !Regex.IsMatch(cell, regexvariable), I wanted to rely on always being able to use Regex.IsMatch(cell, regexvariable) since the majority of DataTables invoking this method will be using the positive match instead of the negative.</li> </ol> <p>Hopefully that helps.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCommunity
    1. USjerhinesmith
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. PORegEx to tell if a string does not contain a specific character
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PORegEx to tell if a string does not contain a specific character
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PORegEx to tell if a string does not contain a specific character
      1. This table or related slice is empty.
      1. VTUpMod
    1. COIf you are only checking for the presence of a single character, you can get by much better without regexes. Kevin is right: use .IndexOf() or something simpler. It'll be more readable, clearer, and faster.
      singulars
      1. PORegEx to tell if a string does not contain a specific character
      1. USruquay
 

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