color trigger on a line with 2 colors

I have a color trigger such as:

<trigger
enabled="y"
group="test"
match="*test string*"
match_text_colour="y"
name="test"
script="triggerStat"
send_to="12"
sequence="100"
text_colour="11"
>

and sometimes I receive output such as:

[info]: *test string*

where [info]: is white and
*test string* is yellow

The trigger does not catch because there is color in the line that is not white? Is there a way around this?
I am using MC version 3.65