Recently, I used vb.net as a forum and found it online. Although I have some conversion code for ubb (vb.net), it is not comprehensive. I have added it here, share it with you.
If you have any questions, please visit my personal Forum www.hushiyu.com.
Public Class ubbs
Function ubb (vstr as string)
'Replacing HTML tags and line feed processing
Vstr = replace (vstr, ">", "> ")
Vstr = replace (vstr, "<", "<")
Vstr = Replace (vstr, CHR (32 ),"")
Vstr = Replace (vstr, CHR (9 ),"")
Vstr = Replace (vstr, CHR (34 ),""")
Vstr = Replace (vstr, CHR (39 ),"'")
Vstr = Replace (vstr, CHR (13 ),"")
Vstr = Replace (vstr, CHR (10), "<BR> ")
Vstr = Replace (vstr, "[enter]", "<BR> ")
Dim xface as integer
If xface = 1 then
'Expression conversion. If the numeric variable xface is set to 1, conversion is allowed.
Vstr = replace (vstr, ":)", " ")
Vstr = replace (vstr, ":(", " ")
Vstr = replace (vstr, ": o", " ")
Vstr = replace (vstr, ": D", " ")
Vstr = replace (vstr, ";)", " ")
Vstr = replace (vstr, ": p", " ")
Vstr = replace (vstr, ": cool:", " ")