Highlighting a portion of text in a textarea

[Kamal Pathi]

How to select/highlight a portion of text in a textarea programmatically using javascript?
For example.
There is a text box which is having values
let us as 1234 ABCD. Onload I want to select/highlight the characters AB.

[Michael McNally]

You need to make a RegExp (regular expression) for this. THe RegExp below searches text in an object. When it finds any a character followed by any b character...it finds a match for a function you can then create such as select() for a text object.
I am not sure about this but here is my guess:
text.select('/([aA][bB])/')
i am sure about the RegExp but not sure if i wrote it correctly. im not even sure if i implemented it correctly.