Use a limit in the negative lookbehind clojureSymbol pattern

$ syntime clj/src/vim_clojure_static/generate.clj

Before:

  TOTAL      COUNT  MATCH   SLOWEST     AVERAGE   NAME               PATTERN
  0.031679   2003   1906    0.000092    0.000016  clojureSymbol      \v%([a-zA-Z!$&*_+=|<.>?-]|[^\x00-\x7F])+%(:?%([a-zA-Z0-9!#$%&*_+=|'<.>/?-]|[^\x00-\x7F]))*[#:]@<!
  0.051484   27016

After:

  TOTAL      COUNT  MATCH   SLOWEST     AVERAGE   NAME               PATTERN
  0.010608   2003   1906    0.000030    0.000005  clojureSymbol      \v%([a-zA-Z!$&*_+=|<.>?-]|[^\x00-\x7F])+%(:?%([a-zA-Z0-9!#$%&*_+=|'<.>/?-]|[^\x00-\x7F]))*[#:]@1<!
  0.030519   27016

$ curl -LO https://raw.githubusercontent.com/http-kit/http-kit/master/src/org/httpkit/client.clj
$ syntime client.clj

Before:

  TOTAL      COUNT  MATCH   SLOWEST     AVERAGE   NAME               PATTERN
  0.029451   2340   2293    0.000079    0.000013  clojureSymbol      \v%([a-zA-Z!$&*_+=|<.>?-]|[^\x00-\x7F])+%(:?%([a-zA-Z0-9!#$%&*_+=|'<.>/?-]|[^\x00-\x7F]))*[#:]@<!
  0.046375   23668

After:

  TOTAL      COUNT  MATCH   SLOWEST     AVERAGE   NAME               PATTERN
  0.010855   2340   2293    0.000031    0.000005  clojureSymbol      \v%([a-zA-Z!$&*_+=|<.>?-]|[^\x00-\x7F])+%(:?%([a-zA-Z0-9!#$%&*_+=|'<.>/?-]|[^\x00-\x7F]))*[#:]@1<!
  0.027972   23668

Thanks to Richard Hull (@rm-hull).

Author: guns

syntax/clojure.vim

@@ -78,7 +78,7 @@ syntax region clojureString matchgroup=clojureStringDelimiter start=/"/ skip=/\\
 
 syntax match clojureCharacter "\v\\%(.$|o%([0-3]\o{2}|\o{1,2})|u\x{4}|newline|tab|space|return|backspace|formfeed)"
 
-syntax match clojureSymbol "\v%([a-zA-Z!$&*_+=|<.>?-]|[^\x00-\x7F])+%(:?%([a-zA-Z0-9!#$%&*_+=|'<.>/?-]|[^\x00-\x7F]))*[#:]@<!"
+syntax match clojureSymbol "\v%([a-zA-Z!$&*_+=|<.>?-]|[^\x00-\x7F])+%(:?%([a-zA-Z0-9!#$%&*_+=|'<.>/?-]|[^\x00-\x7F]))*[#:]@1<!"
 
 " NB. Correct matching of radix literals was removed for better performance.
 syntax match clojureNumber "\v<[-+]?%([2-9]|[12]\d|3[0-6])[rR][[:alnum:]]+>"