Question

I need to capture such string as a TWO separate matches:

MLB m L B

So output should be two matches:

1. MLB 
2. m L B

There maybe any or zero characters between earch of three letters in match.

Answer 1

So one match always has three characters that may be whitespace-separated?

(?:\w\s*){3}

matches MLB or m L M in your example.

To match precisely those letters, use

M\s*L\s*B

and activate the case-insensitive option of your regex implementation.

To allow any character between the letters:

M.*L.*B

(and you can’t get any more basic than that in regex – you’ll want to read a regex tutorial)