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Converting VBScript's Mid Function


Windows PowerShell


Definition: Returns a specified number of characters from a string.

Mid

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 you should get the following:



CDE


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