Flex matches JSON number, string

The number format definitions given on the website are easy to match:

DIGIT   [0-9]DIGITS  {DIGIT}+INT     "-"?([0-9]|[1-9][0-9]*)FRAC    "."{DIGITS}E       [eE][-+]?EXP     {E}{DIGITS}NUMBER  {INT}({FRAC}|{EXP}|{FRAC}{EXP})?

String matching on the complex point, the beginning has not been matched, mainly the problem of transferring characters, and later on the stack overflow found a solution. The main reference for parsing C's Lex file,

• ANSI C Grammar, LEX specification

• ANSI C YACC Grammar

You can match the JSON string with a slight modification:

HEX     [0-9a-fA-F]STRING  \"(\\["\\\/bfnrt]|\\"u"{HEX}{4}|[^\\"\n])*\"

The previous question was not knowing which characters in the brackets to escape, here is the official document describing the flex pattern matching, very detailed.

Flex matches JSON number, string