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How to add column if not exists on PostgreSQL?
...t pass these as parameters, you'll need to do variable substitution in the string on the client side, but this is a self contained query that only emits a message if the column already exists, adds if it doesn't and will continue to fail on other errors (like an invalid data type).
I don't recommend...
Sublime Text 2: How to delete blank/empty lines
...n't need the ?, as a * also matches zero occurences and \s* will match the extra '\r' when for example editing windows text in a linux environment, so ^\s*$ does the trick.
– drevicko
Nov 1 '14 at 9:41
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How to get the directory of the currently running file?
...e recommended way of doing this is with os.Executable:
func Executable() (string, error)
Executable returns the path name for the executable that started the current process. There is no guarantee that the path is still pointing to the correct executable. If a symlink was used to start the process,...
Remove empty elements from an array in Javascript
...d on what you consider to be "empty" for example, if you were dealing with strings, the above function wouldn't remove elements that are an empty string.
One typical pattern that I see often used is to remove elements that are falsy, which include an empty string "", 0, NaN, null, undefined, and fa...
How to rename with prefix/suffix?
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what if "from" or "to" are empty strings, i.e. you want to append something to each filename or remove something completely
– Troyseph
Oct 4 '19 at 14:51
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How do I get a file extension in PHP?
... my pathinfo is disabled then short way to extract extension string ?
– khizar ansari
Aug 10 '12 at 18:20
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Grep characters before and after match?
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3 characters before and 4 characters after
$> echo "some123_string_and_another" | grep -o -P '.{0,3}string.{0,4}'
23_string_and
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JBoss vs Tomcat again [closed]
...Tomcat. That would be almost as lightweigth.
If you won't need any of the extras JBoss has to offer, go for the one you're most comfortable with. Which is easiest to configure and maintain for you?
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Why doesn't Internet Explorer 11 honour conditional comments even when emulating Internet Explorer 8
...r 11 with Internet Explorer 8 compatibility mode turned on contains the string 'MSIE 8.0', so:
(PHP example)
if (strpos($_SERVER['HTTP_USER_AGENT'],'MSIE 8.0') !== false) {
$head[] = sprintf('<link rel="stylesheet" href="ie8.css" />');
}
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What is a word boundary in regex?
...osition between \w and \W (non-word char), or at the beginning or end of a string if it begins or ends (respectively) with a word character ([0-9A-Za-z_]).
So, in the string "-12", it would match before the 1 or after the 2. The dash is not a word character.
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