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Regular expression for matching HH:MM time format
...t number (hours) is either:
a number between 0 and 19 --> [0-1]?[0-9] (allowing single digit number)
or
a number between 20 - 23 --> 2[0-3]
the second number (minutes) is always a number between 00 and 59 --> [0-5][0-9] (not allowing a single digit)
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Detect the Enter key in a text input field
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kudos for the plain javascript version, not sure why all the others are in jquery
– Captain Fantastic
Jun 22 '19 at 16:23
7
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Java, Simplified check if int array contains int
Basically my mate has been saying that I could make my code shorter by using a different way of checking if an int array contains an int, although he won't tell me what it is :P.
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Add new column with foreign key constraint in one command
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As so often with SQL-related question, it depends on the DBMS. Some DBMS allow you to combine ALTER table operations separated by commas. For example...
Informix syntax:
ALTER TABLE one
ADD two_id INTEGER,
ADD CONSTRAINT FOREIGN KEY(two_id) REFERENCES two(id);
The syntax for IBM DB2 LU...
Get characters after last / in url
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This cuts of the first character if there is no slash at all.
– redanimalwar
Nov 2 '15 at 13:55
@red...
The command rbenv install is missing
In Ubuntu 10.04 I just installed rbenv .
The install command is not present.
8 Answers
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How can I “unuse” a namespace?
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Yeah this doesn't really address the problem he's having of headers using namespaces.
– Kip
Oct 3 '08 at 17:57
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How to remove single character from a String
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You can use Java String method called replace, which will replace all characters matching the first parameter with the second parameter:
String a = "Cool";
a = a.replace("o","");
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Skip download if files exist in wget?
... when you are downloading from a location that was copied, changing all the timestamps.
– Robert
Oct 28 '16 at 16:22
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How can I check whether an array is null / empty?
....println("array is empty");
}
An alternative definition of "empty" is if all the elements are null:
Object arr[] = new Object[10];
boolean empty = true;
for (int i=0; i<arr.length; i++) {
if (arr[i] != null) {
empty = false;
break;
}
}
or
Object arr[] = new Object[10];
boolean e...