regex - How to match any characters except a set of contiguous characters? -


I am trying to match all the letters of the character until the pattern A0343443 ( A [0- 9] + )

Input: 

  A546454: This and that happened in C: \ user \ John \ document \ folder in a file reading B546454 An error occurred: It happened in C: \ User \ John \ Documents \ folder There was an error reading the file A595949: C: \ user \ John \ document \ ....   
 Desired output:  
  A546454: this and more There was an error in reading: \ user \ John \ document \ folder file A595949: This is the second thing in C: \ user \ John \ document \ ....   
 Because the line ending is uncertain, I want to finish when I'm positive for reaching <0 >> [0- 9] +  or  B [0- 9] +  Saw:  
  ^ (? A [0- 9] +)   
 but it fails in the first capital  A   
 i.e. the  the very essence of chocolate  to prevent it.  
 Any thoughts?  
 Thanks   
 
 
 Since your lines are  A  or < Code> b , you can use a  negative lookhead .  
  ^ (?! B [0-9] +). $$   
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