number

Распознование чисел

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Grammar_and_types

= number types = == float point ==

[digits].[digits][(E|e)[(+|-)]digits]

3.1415926
.123456789
3.1E+12
.1e-23

== integer ==

0, 117, 123456789123456789n             (decimal, base 10)
015, 0001, 0o777777777777n              (octal, base 8)
0x1123, 0x00111, 0x123456789ABCDEFn     (hexadecimal, "hex" or base 16)
0b11, 0b0011, 0b11101001010101010101n   (binary, base 2)

= grammar =

number ::= [ unary_minus ] integer | float

integer ::= octal_int | hex_int | bin_int | dec_int octal_int ::= '0' [ 'o' | 'O' ] { octal_digit } [ 'n' ] hex_int ::= '0' ( 'x' | 'X' ) { hex_digit } [ 'n' ] bin_int ::= '0' ( 'b' | 'B' ) { bin_digit } [ 'n' ] dec_int ::= dec_digit { dec_digit } [ 'n' ]

 bin_digit ::= '0' | '1'

octal_digit ::= '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' dec_digit ::= '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9' hex_digit ::= '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9' | 'a' | 'b' | 'c' | 'd' | 'e' | 'f' | 'A' | 'B' | 'C' | 'D' | 'E' | 'F'

float ::= dec_part '.' fraction_part ( 'e' | 'E' ) [ '-' | '+' ] exponent_part | dec_part '.' fraction_part | dec_part '.' ( 'e' | 'E' ) [ '-' | '+' ] exponent_part | dec_part '.' | '.' fraction_part ( 'e' | 'E' ) [ '-' | '+' ] exponent_part | '.' fraction_part

dec_part ::= dec_digit { dec_digit } fraction_part ::= dec_digit { dec_digit } exponent_part ::= dec_digit { dec_digit }