Some text matching questions

[lnminente]

Could someone explain me why this happens?

Create a new filter and use this as matching code:
(
<$SET(open=1)|
>$SET(open=)
)PrxFail$TST()|
?(^$TST(open=1))

Go to the test window and paste this:
<font color="pink">BLA</font>
<font color="pink">BLA</font>
BLA BLA BLA
<font color="pink">[table]</font>
BLA BLA BLA
<font color="pink">[table]</font>

The result in the test windows is:
<font color="pink"</font<font color="pink"</font<font color="pink"</font<font color="pink"</font

It matched the > symbols!!
To have this working i add (^>) before ?, but i would like to know why the first doesn't work. Maybe it was too fast and proxomitron had no time to set open=nothing?