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int  "-"?([0-9]|[1-9][0-9]+)
exp  [eE][-+]?[0-9]+
frac  "."[0-9]+

%%
\s+      /* skip whitespace */

{int}{frac}?{exp}?\b    return 'NUMBER'
\"(?:'\\'[\\"bfnrt/]|'\\u'[a-fA-F0-9]{4}|[^\\\0-\x09\x0a-\x1f"])*\"    yytext = yytext.substr(1,yyleng-2); return 'STRING'

"{"      return '{'
"}"      return '}'
"["      return '['
"]"      return ']'
","      return ','
":"      return ':'
"true"   return 'TRUE'
"false"  return 'FALSE'
"null"   return 'NULL'
<<EOF>>  return 'EOF'
.        return 'INVALID'

%%