Write instead:

    select * from table where name ~ &#39;foo&#39;

The &#39;~&#39; operator produces a boolean result for whether the regex matches or not rather than extracting the matching subgroups.

What are the differences between SVG and HTML5 Canvas? They both seem to do the same to me. Basically, they both draw vector artwork using coordinate points.

What am I missing? What are the major differences between SVG and HTML5 Canvas? Why should I choose one over the other?

What is the difference between SVG and HTML5 Canvas?

My teacher in an upper level Java class on threading said something that I wasn&#39;t sure of.

He stated that the following code would not necessarily update the `ready` variable.  According to him, the two threads don&#39;t necessarily share the static variable, specifically in the case when each thread (main thread versus `ReaderThread`) is running on its own processor and therefore doesn&#39;t share the same registers/cache/etc and one CPU won&#39;t update the other.

Essentially, he said it is possible that `ready` is updated in the main thread, but NOT in the `ReaderThread`, so that `ReaderThread` will loop infinitely.

He also claimed it was possible for the program to print `0` or `42`.  I understand how `42` could be printed, but not `0`.  He mentioned this would be the case when the `number` variable is set to the default value.

I thought perhaps it is not guaranteed that the static variable is updated between the threads, but this strikes me as very odd for Java.  Does making `ready` volatile correct this problem?

He showed this code:  

    public class NoVisibility {  
        private static boolean ready;  
        private static int number;  
        private static class ReaderThread extends Thread {   
            public void run() {  
                while (!ready)   Thread.yield();  
                System.out.println(number);  
            }  
        }  
        public static void main(String[] args) {  
            new ReaderThread().start();  
            number = 42;  
            ready = true;  
        }  
    }


Are static variables shared between threads?

I currently have the the following query:

    select regexp_matches(name, &#39;foo&#39;) from table;

How can I rewrite this so that the regex is in the where like the following (not working):

    select * from table where regexp_matches(name, &#39;foo&#39;);

Current error message is:
ERROR: argument of WHERE must be type boolean, not type text[]
SQL state: 42804
Character: 29


Using regex in WHERE in Postgres

I currently have the the following query:
<pre><code class="hljs language-csharp">select regexp_matches(name, 'foo') from table;
</code></pre>
How can I rewrite this so that the regex is in the where like the following (not working):
<pre><code class="hljs language-csharp">select * from table where regexp_matches(name, 'foo');
</code></pre>
Current error message is:
ERROR: argument of WHERE must be type boolean, not type text[]
SQL state: 42804
Character: 29

Could anyone help me to assemble a pattern that matches an arbitrary sequence of spaces and tabs? 

How to create a regex that will match an arbitrary sequence of spaces and tabs

testing= testing.match(/(\d{5})/g);

I&#39;m reading a full html into variable. From the variable, want to grab out all numbers with the pattern of exactly 5 digits. No need to care of whether before/after this digit having other type of words. Just want to make sure whatever that is 5 digit numbers been grabbed out.

However, when I apply it, it not only pull out number with exactly 5 digit, number with more than 5 digits also retrieved...

I had tried putting `^` in front and `$` behind, but it making result come out as null.

regular expression to match exactly 5 digits

I&#39;m trying to open a webpage using `urllib.request.urlopen()` then search it with regular expressions, but that gives the following error:

&gt; TypeError: can&#39;t use a string pattern on a bytes-like object

I understand why, `urllib.request.urlopen()` returns a bytestream, so `re` doesn&#39;t know the encoding to use. What am I supposed to do in this situation? Is there a way to specify the encoding method in a urlrequest maybe or will I need to re-encode the string myself? If so what am I looking to do, I assume I should read the encoding from the header info or the encoding type if specified in the html and then re-encode it to that?

How to handle response encoding from urllib.request.urlopen() , to avoid TypeError: can&#39;t use a string pattern on a bytes-like object

I want to remove numbers from a string:

    questionText = &quot;1 ding ?&quot;

I want to replace the number `1` number and the question mark `?`. It can be any number. I tried the following non-working code. 

    questionText.replace(/[0-9]/g, &#39;&#39;);

How to remove numbers from a string?

What is the regex for simply checking if a string contains a certain word (e.g. &#39;Test&#39;)? I&#39;ve done some googling but can&#39;t get a straight example of such a regex. This is for a build script but has no bearing to any particular programming language.

Regex for string contains?

I have to execute a loop in database. This is only a one time requirement.
After executing the function, I am dropping the function now.

Is there any good approach for creating temporary / disposable functions?

How to create a temporary function in PostgreSQL?

**Is there any site available online for verifying the syntax which conforms to multiple databases?**

For example: If I have a SQL statement with a &#39;usage&#39; keyword, then the site should throw me an error saying that &#39;usage&#39; keyword is reserved in MYSQL?

Online SQL syntax checker conforming to multiple databases

In postgresql, how do I replace all instances of a string within a database column?

Say I want to replace all instances of `cat` with `dog`, for example.

What&#39;s the best way to do this?

postgresql - replace all instances of a string within text field

I have a database that was set up with the default character set SQL_ASCII.  I want to switch it to UNICODE.  Is there an easy way to do that?

How do you change the character encoding of a postgres database?

How can I kill all my postgresql connections?

I&#39;m trying a `rake db:drop` but I get:

    ERROR:  database &quot;database_name&quot; is being accessed by other users
    DETAIL:  There are 1 other session(s) using the database.

I&#39;ve tried shutting down the processes I see from a `ps -ef | grep postgres` but this doesn&#39;t work either:

    kill: kill 2358 failed: operation not permitted




Content Type	Original Author	Original Content on Stackoverflow
Question	David	View Question on Stackoverflow
Solution 1 - Regex	araqnid	View Answer on Stackoverflow

Using regex in WHERE in Postgres

Regex Problem Overview

Regex Solutions

Solution 1 - Regex

Are static variables shared between threads?

What is the difference between SVG and HTML5 Canvas?

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