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how to use sed, awk, or gawk to print only what is matched?
.... Since match() returns the character position, or index, of where that substring begins (1, if it starts at the beginning of string), it triggers the print action.
With grep you can use a look-behind and look-ahead:
$ grep -oP '(?<=abc)[0-9]+(?=xyz)' file
12345
$ grep -oP 'abc\K[0-9]+(?=xyz...
Behaviour of final static method
...
public class Test { final static public void main(String... srik) { System.out.println("In main method"); ts(); } public static void ts() { Child c=new Child(); c.ts(); System.out.println("Test ts"); } } public class Child extends Test { public stat...
How to make the corners of a button round?
...wrap_content"
android:layout_height="wrap_content"
android:text="@string/Shape"
android:background="@drawable/shape"/>
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How can I default a parameter to Guid.Empty in C#?
...in ASP.NET MVC controller action? All other optional parameters work (int, string) but it doesn't work for GUID, says "Server Error in '/' Application. The parameters dictionary contains a null entry for parameter 'categoryId' of non-nullable type 'System.Guid' .." The code compiles fine with both s...
Ignore Typescript Errors “property does not exist on value of type”
...operty 'name' does not exist on type 'Function'" for this code:
let name: string = this.constructor.name;
So I fixed it with:
let name: string = (<any>this).constructor.name;
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Algorithm for classifying words for hangman difficulty levels as “Easy”,“Medium”, or “Hard”
...ion of this algorithm in Python:
from collections import defaultdict
from string import ascii_lowercase
def partition(guess, words):
"""Apply the single letter 'guess' to the sequence 'words' and return
a dictionary mapping the pattern of occurrences of 'guess' in a
word to the list of...
Java: Static vs inner class [duplicate]
...c int x; // allowed here
}
}
class Test
{
public static void main(String… str)
{
A a = new A();
// Non-Static Inner Class
// Requires enclosing instance
A.B obj1 = a.new B();
// Static Inner Class
// No need for reference of object to...
How can I view the source code for a function?
...ls to some of the above functions may use an object instead of a character string to reference the compiled function. In those cases, the object is of class "NativeSymbolInfo", "RegisteredNativeSymbol", or "NativeSymbol"; and printing the object yields useful information. For example, optim calls ....
do..end vs curly braces for blocks in Ruby
... I see no reason that an editor would have trouble finding a 2/3 character string versus a single character. Though there is the argument that most editors already match braces, whereas do ... end is a special case which requires language specific logic.
– Chinoto Vokro
...
How to declare a variable in MySQL?
...riable that has not been
initialized, it has a value of NULL and a type of string.
SELECT @var_any_var_name
You can initialize a variable using SET or SELECT statement:
SET @start = 1, @finish = 10;
or
SELECT @start := 1, @finish := 10;
SELECT * FROM places WHERE place BETWEEN @start AN...