If you put spaces before and after your fields names in your original lcStr, then search for the expression with the spaces before and after this should work.

lcStr = ;
"WHERE Code # ParentCode OR PCOFLAG = 'P'"

lcStr = ;
STRTRAN(lcStr, " Code ", " lnd1.Code ")

lcStr = ;
STRTRAN(lcStr, " ParentCode ", " lnd1.ParentCode ")

lcStr = ;
STRTRAN(lcStr, " PCOFLAG ", " lnd1.PCOFLAG ")


Lister...

>Hi everyone,
>
>I have some expression, which is either filter() or for() or combination of both. I'd like to insert Alias Lnd1 before each field, which may be in this expression. Example:
>

lcStr=where CODE#PARENTCODE.OR.PCOFLAG="P"

>
>I need to convert it to 'where lnd1.code#lnd1.parentcode OR lnd1.PCOFLAG="P"'
>
>I was thinking about checking this string against each field and do simple strtran, but it would not work, since I have fieldnames, which are part of other field names.
>
>Could you please help me?
>
>Thanks in advance.