node_modules/prismjs/tests/languages/j/number_feature.test

2.3e2 2.3e_2 2j3
230 0.023 2j3

2p1 1p_1
6.28319 0.31831

1x2 2x1 1x_1
7.38906 5.43656 0.367879

2e2j_2e2 2e2j2p1 2ad45 2ar0.785398
200j_200 628.319j6.28319 1.41421j1.41421 1.41421j1.41421

16b1f 10b23 _10b23 1e2b23 2b111.111
31 23 _17 203 7.875

_ __

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[
	["number", "2.3e2"], ["number", "2.3e_2"], ["number", "2j3"],
	["number", "230"], ["number", "0.023"], ["number", "2j3"],

	["number", "2p1"], ["number", "1p_1"],
	["number", "6.28319"], ["number", "0.31831"],

	["number", "1x2"], ["number", "2x1"], ["number", "1x_1"],
	["number", "7.38906"], ["number", "5.43656"], ["number", "0.367879"],

	["number", "2e2j_2e2"], ["number", "2e2j2p1"], ["number", "2ad45"], ["number", "2ar0.785398"],
	["number", "200j_200"], ["number", "628.319j6.28319"], ["number", "1.41421j1.41421"], ["number", "1.41421j1.41421"],

	["number", "16b1f"], ["number", "10b23"], ["number", "_10b23"], ["number", "1e2b23"], ["number", "2b111.111"],
	["number", "31"], ["number", "23"], ["number", "_17"], ["number", "203"], ["number", "7.875"],

	["number", "_"], ["number", "__"]
]

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Checks for numbers.