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Is there a regular expression to detect a valid regular expression?
...group start
(?:
(?:[^?+*{}()[\]\\|]+ # literals and ^, $
| \\. # escaped characters
| \[ (?: \^?\\. | \^[^\\] | [^\\^] ) # character classes
(?: [^\]\\]+ | \\. )* \]
| \( (?:\?[:=!]|\?<[=!]|\?>)? (?1)?? ...
Unix shell script to truncate a large file
...an application when it reaches say 3GB of space. I know that the below command would do it :
4 Answers
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How to fix a locale setting warning from Perl?
...settings:
LC_ALL = (unset),
LANG = "en_US.UTF-8"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
My guess is you used ssh to connect to this older host from a newer desktop machine. It's common for /etc/ssh/sshd_config to contain
Ac...
Is there a “standard” format for command line/shell help text?
If not, is there a de facto standard? Basically I'm writing a command line help text like so:
8 Answers
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What's the 'environment' task in Rake?
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You can get access to your models, and in fact, your whole environment by making tasks dependent on the environment task. This lets you do things like run rake RAILS_ENV=staging db:migrate.
See "Custom Rake Tasks".
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How to make input type= file Should accept only pdf and xls
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You could do so by using the attribute accept and adding allowed mime-types to it. But not all browsers do respect that attribute and it could easily be removed via some code inspector. So in either case you need to check the file type on the server side (your second que...
Passing two command parameters using a WPF binding
I have a command which I am executing from my XAML file using the following standard syntax:
5 Answers
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1114 (HY000): The table is full
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@Nadh In Ubuntu 16.04 it's part of /etc/mysql/ and is partly splitted into additional files in /etc/mysql/conf.d
– Martin C.
Jun 17 '17 at 22:01
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How can you integrate a custom file browser/uploader with CKEditor?
...ed. An optional third parameter can be text that you want displayed in a standard alert dialog, such as "illegal file" or something. Set url to an empty string if the third parameter is an error message.
CKEditor's "upload" tab will submit a file in the field "upload" - in PHP, that goes to $_FILES...
What's the best way to detect a 'touch screen' device using JavaScript?
I've written a jQuery plug-in that's for use on both desktop and mobile devices. I wondered if there is a way with JavaScript to detect if the device has touch screen capability. I'm using jquery-mobile.js to detect the touch screen events and it works on iOS, Android etc., but I'd also like to writ...