Mid
Definition: Returns a specified number of characters from a
string.
Sometimes the good stuff – at least when it comes to Oreo cookies and string values – is found in the middle. With Oreos you can get to the stuff in the middle by unscrewing the cookie; with string values you can get to the stuff in the middle by calling the Substring( )method. In the following example we assign a string value to the variable $a and then use the SubString () method to retrieve a portion of that string. And what portion are we retrieving? To answer that, let’s first look at the two commands:
$a="ABCDEFG"
$a = $
a.substring
(2,3)
Notice that we’re passing Substring() two parameters: a 2 and a 3. The 2 represents the character position in the main string where we want to start grabbing letters. We want to start with the third character, so we pass a 2. No, that’s not a typo: we pass a 2 because the first character in the string is in position 0. That means the second character is found in position 1, and the third character – the one we’re interested in – resides in position 2. The 3, meanwhile, indicates the number of characters we want to extract. In other words, we want to start at position 2 and grab the next three characters.
Pretty simple when you think about it.
When you run this command and then echo back the value of $ a youshould get the following:
CDE