fix encodings for tek and adobe

fact_helper_file/mime/custom_mime_encoding

@@ -10,14 +10,17 @@
 !:mime  firmware/srecord
 
 # Tektronik HEX file format
-0   regex  \^/[0-9A-F]{8,}$  Tektronix HEX; binary data in text format
+0   string /
+>1  regex  [0-9A-F]{8,}$  Tektronix HEX; binary data in text format
 !:mime  firmware/tek
 
 # Tektronik Extended HEX file format
-0   regex  \^%[0-9A-F]{8,}$  Tektronix extended HEX; binary data in text format
+0    string %
+>4   string 6
+>1   regex  [0-9A-F]{8,}$  Tektronix extended HEX; binary data in text format
 !:mime  firmware/xtek
 
 # Adobe Ascii85 stream
 0   string  <~
->2   regex  [a-zA-Z0-9!#$%&()*+;<=>?@^_`-]{20,}    Adobe ASCII85 encoding
+>2  regex  [a-zA-Z0-9!#$%&()*+;<=>?@^_`-]{20,}    Adobe ASCII85 encoding
 !:mime  firmware/adobe85