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Check if a string matches a regex in Bash script
... can define a regex in Bash matching the format you want. This way you can do:
[[ $date =~ ^regex$ ]] && echo "matched" || echo "did not match"
where commands after && are executed if the test is successful, and commands after || are executed if the test is unsuccessful.
Note this i...
Run a callback only if an attribute has changed in Rails
...
Rails 5.1+
class Page < ActiveRecord::Base
before_save :do_something, if: :will_save_change_to_status_id?
private
def do_something
# ...
end
end
The commit that changed ActiveRecord::Dirty is here: https://github.com/rails/rails/commit/16ae3db5a5c6a08383b974ae6c96faa...
How do I horizontally center a span element inside a div
... project' inside the surrounding div. Can someone point out what I need to do to make this work?
7 Answers
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What's wrong with using $_REQUEST[]?
...ber of posts on here saying not to use the $_REQUEST variable. I usually don't, but sometimes it's convenient. What's wrong with it?
...
How do I escape the wildcard/asterisk character in bash?
...haviour. So use echo "$foo" in instead of just echo $foo.
LONG ANSWER
I do think this example warrants further explanation because there is more going on than it might seem on the face of it.
I can see where your confusion comes in because after you ran your first example you probably thought to...
Why would an Enum implement an Interface?
...
Enums don't just have to represent passive sets (e.g. colours). They can represent more complex objects with functionality, and so you're then likely to want to add further functionality to these - e.g. you may have interfaces such...
Disadvantages of Test Driven Development? [closed]
What do I lose by adopting test driven design?
31 Answers
31
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How do I strip non alphanumeric characters from a string and keep spaces?
...ion: @search_query.gsub(/[^0-9a-z\\s]/i, '')
– David Douglas
Dec 6 '13 at 12:09
6
slightly less w...
Selecting a row in DataGridView programmatically
...
Not tested, but I think you can do the following:
dataGrid.Rows[index].Selected = true;
or you could do the following (but again: not tested):
dataGrid.SelectedRows.Clear();
foreach(DataGridViewRow row in dataGrid.Rows)
{
if(YOUR CONDITION)
r...
In a Git repository, how to properly rename a directory?
... But if you want to rename from casesensitive to CaseSensitive, you can do this way: git mv casesensitive Temp and then git mv Temp CaseSensitive
– ViliusK
Feb 9 '14 at 21:03
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