encoding mime FP bugfix

fact_helper_file/mime/custom_mime_encoding

@@ -6,21 +6,21 @@
 
 # Motorola S-Record
 0 	string   S
->1  regex  [0-3][0-9A-F]{8,}$  Motorola S-Record; binary data in text format
+>1  regex  \^[0-3][0-9A-F]{8,}  Motorola S-Record; binary data in text format
 !:mime  firmware/srecord
 
 # Tektronik HEX file format
 0   string /
->1  regex  [0-9A-F]{8,}$  Tektronix HEX; binary data in text format
+>1  regex  \^[0-9A-F]{12,}  Tektronix HEX; binary data in text format
 !:mime  firmware/tek
 
 # Tektronik Extended HEX file format
 0    string %
 >4   string 6
->1   regex  [0-9A-F]{8,}$  Tektronix extended HEX; binary data in text format
+>1   regex  \^[0-9A-F]{12,}  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