Difference between two strings in VBScript -

i need way find difference between 2 strings in windows application using vbscript. 1 of strings known second 1 unknown during coding. know there functions strcompare, instr etc. these require know second string during coding.

explanation:

there text box in screen , there several buttons in same screen. , when buttons clicked, text in text box changes depending on button clicked. there way find changes made text after button clicked ? need text entered due button click. there simple way or requires complex coding ?

thanks in advance.

it depends on application , format of new string.

if need find text appended original string, take new text , replace first occurrence of original string empty string:

dim strold, strnew, strdiff  strold = "apple" strnew = "apple, orange"  strdiff = replace(strnew, strold, "", 1, 1) wscript.echo strdiff 

sample output:

, orange

or if need appended text without preceding comma, use this:

strdiff = replace(strnew, strold + ", ", "", 1, 1)