Hi OC Support,
I think you misread the original email. The search mentioned is not for the letter "i" but for the number "9".
Also, it is unfair to assume that "contains" for single letter would be useless. In some cases it can be exactly what is needed. (eg if I have hundreds of files, only a few have "z" in the file name but I don't know or care what letter follows the "z")
You asked "What did you mean 'take Space as *?' "
That means use space as the wildcard character, commonly "*" in expression matching - to mean any number of any characters.
Regards; David