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Django optional url parameters
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There are several approaches.
One is to use a non-capturing group in the regex: (?:/(?P<title>[a-zA-Z]+)/)?
Making a Regex Django URL Token Optional
Another, easier to follow way is to have multiple rules that matches your needs, all pointing to the same view.
urlpatterns =...
Android: How to enable/disable option menu item on button click?
...to invisible is not better in nearly all use cases. In the case you have a group its better they stay in their positions and greyed out indicates to the user that there is an option that can be enabled in a certain program state. making thing invisible and invisible and probably causing layout chang...
file_put_contents(meta/services.json): failed to open stream: Permission denied
...n it.
To fix this temporary you have to manually give permissions for the group 664 to this file so both your login user and webserver user can write to that log file.
To avoid this issue permanently you may want to setup a proper permissions when a new file is create within the storage/logs dir ...
String replacement in java, similar to a velocity template
...result = format;
while (m.find()) {
String[] found = m.group(1).split("\\.");
Object o = objects.get(found[0]);
Field f = o.getClass().getField(found[1]);
String newVal = f.get(o).toString();
result = result.replaceFirst(regex, newV...
Delete with Join in MySQL
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@Yehosef, There's a group of people who find the CAPS really glaring. I believe I'm not the only one, I've seen quite a few people going lowercase style too.
– Pacerier
Apr 13 '15 at 12:09
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How to display length of filtered ng-repeat data
...It is also useful to note that you can store multiple levels of results by grouping filters
all items: {{items.length}}
filtered items: {{filteredItems.length}}
limited and filtered items: {{limitedAndFilteredItems.length}}
<div ng-repeat="item in limitedAndFilteredItems = (filteredItems = (item...
SVG drop shadow using css3
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dam, if this only worked on groups and shapes in the SVG!
– OG Sean
Mar 24 at 20:25
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When do we need curly braces around shell variables?
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You use {} for grouping. The braces are required to dereference array elements. Example:
dir=(*) # store the contents of the directory into an array
echo "${dir[0]}" # get the first entry.
echo "$dir[0]" # incorrect
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Get the index of the nth occurrence of a string?
...value) + ").*?){" + n + "}");
if (m.Success)
return m.Groups[2].Captures[n - 1].Index;
else
return -1;
}
}
Note: I have added Regex.Escape to original solution to allow searching characters which have special meaning to regex engine.
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Examples of Algorithms which has O(1), O(n log n) and O(log n) complexities
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If you want examples of Algorithms/Group of Statements with Time complexity as given in the question, here is a small list -
O(1) time
Accessing Array Index (int a = ARR[5];)
Inserting a node in Linked List
Pushing and Poping on Stack
Insertion and Removal ...