possible WordReplace/WordAdd bug

It seems there is a bug in WordReplace/WordAdd which does not allow a replacement/deletion of a word to happen when the matching pattern is at the beginning of the string.

for instance:

with $0 being "testing123"

${un.WordReplace} $0 "test" "" "+" $0

after this call, $0 remains testing123

however,

${un.WordReplace} $0 "ing1" "" "+" $0

$0 becomes "test23"

I have the same problem when I try to remove a string using wordadd. It is entirely possible I'm calling these functions incorrectly, but I have spent a while trying to get them to work and am unable to.

You are right. Interesting that "test" in next examples deletes. I'll fix it, thanks.

${WordReplace} "testing123" "test" "" "+1" $0

#or

${WordReplace} "testing123" "test" " " "+" $0

P.S.
Can you reproduce bug of WordAdd

when $0 is "testing123"

${WordAdd} $0 "" "-test" $0

$0 remains "testing123"

${WordAdd} $0 "" "-ing" $0

$0 becomes "test123"

WordAdd can't take empty delimiter. Is your example correct?

${WordAdd} "testing123" "" "E-ing" $0

$0 == "1" (delimiter is empty)

I was attempting to remove the first item from a comma deliminated list

when $0 is "test,something,other,no"

${WordAdd} $0 "," "-test" $0

fails, at least for me.

I have tested it and all ok. (output: "something,other,no")

fails, at least for me.

How fails?