Variable numericRegexConst

Captures the individual elements of a numeric string.

Capture groups:

#	Description	Example(s)
0	entire string	"2 1/3" from "2 1/3"
1	"negative" dash	"-" from "-2 1/3"
2	whole number or numerator	"2" from "2 1/3"; "1" from "1/3"
3	entire fraction, decimal portion, or denominator	" 1/3" from "2 1/3"; ".33" from "2.33"; "/3" from "1/3"

Capture group 2 may include comma/underscore separators.

Example

numericRegex.exec("1")     // [ "1",     "1", null,   null ]
numericRegex.exec("1.23")  // [ "1.23",  "1", ".23",  null ]
numericRegex.exec("1 2/3") // [ "1 2/3", "1", " 2/3", " 2" ]
numericRegex.exec("2/3")   // [ "2/3",   "2", "/3",   null ]
numericRegex.exec("2 / 3") // [ "2 / 3", "2", "/ 3",  null ]
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