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Matching a space in regex
...ut the basic idea would be:
$newtag = preg_replace ("/ +/", " ", $tag); # convert all multispaces to space
$newtag = preg_replace ("/^ /", "", $tag); # remove space from start
$newtag = preg_replace ("/ $/", "", $tag); # and end
...
Define: What is a HashSet?
... elements you can either use an enumerator or use the built-in function to convert the HashSet into a List and iterate through that. Take a look here
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How to recognize USB devices in Virtualbox running on a Linux host? [closed]
...y success. It seems they are not detected by Virtualbox itself, since if I select the guest from the Virtualbox home (I'm using a Windows XP 3 guest), choose Settings -> USB -> Add filter from device, no devices is listed, even if an USB pen is attached and recognized by my Lubuntu 13.10. If i run t...
How to Validate a DateTime in C#?
...s another variation of the solution that returns true if the string can be converted to a DateTime type, and false otherwise.
public static bool IsDateTime(string txtDate)
{
DateTime tempDate;
return DateTime.TryParse(txtDate, out tempDate);
}
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Count number of days between two dates
... dates.
The one that comes closest is by thatdankent. A full answer would convert to_i and then divide:
(Time.now.to_i - 23.hours.ago.to_i) / 86400
>> 0
(Time.now.to_i - 25.hours.ago.to_i) / 86400
>> 1
(Time.now.to_i - 1.day.ago.to_i) / 86400
>> 1
In the question's specific e...
Limiting the number of records from mysqldump?
... @Phob: The --where option is basically appended to a query of the form SELECT * from table WHERE , so in this case you get SELECT * from table WHERE 1 limit 1000000. Without the 1, you would have an invalid query. Specifying 1 for a where clause (since 1 is always true) simply selects all reco...
How to calculate time difference in java?
...
Just like any other language; convert your time periods to a unix timestamp (ie, seconds since the Unix epoch) and then simply subtract.
Then, the resulting seconds should be used as a new unix timestamp and read formatted in whatever format you want.
Ah...
“Variable” variables in Javascript?
...You can use the JavaScript eval(str) function.
What this function does is convert the string provided into JS code, then executes it.
For example:
eval("console.log('hello world')"); // Logs hello world
So to use it as a variable variable, you can do the following:
var a = "hello";
var hello =...
Postgres dump of only parts of tables for a dev snapshot
...r larger tables you can use the COPY command to pull out subsets...
COPY (SELECT * FROM mytable WHERE ...) TO '/tmp/myfile.tsv'
COPY mytable FROM 'myfile.tsv'
https://www.postgresql.org/docs/current/static/sql-copy.html
You should consider maintaining a set of development data rather than just ...
Play audio with Python
...k like it can play .mp3 files without external libraries. You could either convert your .mp3 file to a .wav or other format, or use a library like PyMedia.
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