substring in vbscript

I didn't find a vbscript section, but one certanly know it...
I want to extract a part of a string, let say: chars 1 to 4
of a 11 char strings, and also if possible to check if a char exist in a certan position...

let say that I read from a file a couple of lines like

 AAA=1292
 BBB=1291
 CCCCCC=1029

if I don't know in advance the lenght of the left side,
how can I do? I know how to read from a file, but not
how to deal with string functions...

jfbeAsked:
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tecbuilderCommented:
What it sounds like you are wanting to do is parse out the variable name and it's value.

You can use the InStr function to get the position of a certain character.  For example:  S = 'CCCCCC=1029'
thePosition = InStr(S,'=')
In this example, thePosition = 7.  If the '=' character would not have been found then thePosition = 0.

To get the length of the string use the Len function:
 Len(S, lenS)
where lenS is the number of characters of the string S which is 11.

Next to get the variable name and value associated with it use the Left and Right functions:
 varName = Left(S, thePosition-1) or Left(S, 6)
 varValue = Right(S, lenS-thePosition1) or Right(S, 4)

The Left function starts on the left side of the string and gets thePosition-1 characters.  The Right function starts on the right side of the string and gets the lenS-thePosition+1 characters.  
If you wanted to use just the Left function then you would have to chop up the string after each iteration so that the string only contained the characters that had not yet been checked.  This would be required if you were doing more than one parse sequence for the line.  For example:  
AAA=1234 BBB=5678 CCCCCC=3938

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