numbers.swift

// Valid decimal
10
-1000
-1_000
42_42_42
0755
0123456789
0.0
-42.0123456789
1_000.234_567_89
1e2
4.567e5
-2E-4
1e+0

// Valid hex
0x10
0x7FFFFFFF
0xBadFace
0x0123_4567_89ab_cdef
0x1p0
0x1p-2
0xFEEDp+3
0x1234.5P4
0x123.45P8
0x12.345P12
0x1.2345P16
0x0.12345P20

// Valid octal
0o10
0o755
-0o0123_4567

// Valid binary
-0b101010
0b111_101_101
0b1011_1010_1101

// Invalid number-like strings
.1
2.
1.2.
1.2.3
0.1a
5e
0x1p
0x1p_2
0x1.2f
0x1.5pa
0x1.5w
0x1.1p+1f
0x1pz
-.5
.2f
12f
42z
0b
0b_0_1
0b23
0b1.2010
0b12.5
0b101.012
0b101.4
0x_1p+3q
0x0.1p
0x
0xG
0x_
0o
0o1.2
0a
0o8

// Invalid expressions involving numbers
1 .2
1*.2
tuple.0x1

// Weird-looking but potentially valid expressions involving numbers
_012
1._2
tuple.1
tuple.42
1.property
1.5.property
0x1.f
1+2
0x1p2+0x1p3
29.-.42
29.-.0x42
29.&.0b1
29.^.0o7
0x1...0x10
1..<5
1..5

numeric-literals.plist

{	name = 'constant.numeric.float.decimal.swift';
	comment = '0.1, -4_2.5, 6.022e23, 10E-5';
	match = '(\B\-|\b)(?<![^.]\.)[0-9][0-9_]*(?:\.[0-9][0-9_]*)?(?:[eE][+\-]?[0-9][0-9_]*)?\b(?!\.[0-9])';
},
{	name = 'constant.numeric.float.hexadecimal.swift';
	comment = '-0x1.ap2_3, 0x31p-4';
	match = '(\B\-|\b)(?<![^.]\.)(0x\h[\h_]*)(?:\.\h[\h_]*)?[pP][+\-]?[0-9][0-9_]*\b(?!\.[0-9])';
},
{	name = 'invalid.illegal.numeric.float.invalid-exponent.swift';
	comment = '0x1p, 0x1p_2, 0x1.5pa, 0x1.1p+1f, 0x1pz';
	match = '(\B\-|\b)(?<![^.]\.)(0x\h[\h_]*)(?:\.\h[\h_]*)?(?:[pP][+\-]?\w*)\b(?!\.[0-9])';
},
{	name = 'invalid.illegal.numeric.float.missing-exponent.swift';
	comment = '0x1.5w (note that 0x1.f may be a valid expression)';
	match = '(\B\-|\b)(?<![^.]\.)(0x\h[\h_]*)\.[0-9][\w.]*';
},
{	name = 'invalid.illegal.numeric.float.missing-leading-zero.swift';
	comment = '-.5, .2f (note that 1.-.5 may be a valid expression)';
	match = '(?<=\s|^)\-?\.[0-9][\w.]*';
},
{	name = 'invalid.illegal.numeric.leading-underscore.swift';
	comment = '0b_0_1, 0x_1p+3q';
	match = '(\B\-|\b)0[box]_[\h_]*(?:[pPeE][+-]?\w+)?[\w.]+';
},
{	comment = 'tuple positional member: not really a numeric literal, but not invalid';
	match = '(?<=[^.]\.)[0-9][0-9_]*\b';
},
{	name = 'constant.numeric.integer.binary.swift';
	comment = '0b010, 0b1_0';
	match = '(\B\-|\b)(?<![^.]\.)0b[01][01_]*\b(?!\.[0-9])';
},
{	name = 'constant.numeric.integer.octal.swift';
	comment = '0o1, 0o7_3';
	match = '(\B\-|\b)(?<![^.]\.)0o[0-7][0-7_]*\b(?!\.[0-9])';
},
{	name = 'constant.numeric.integer.decimal.swift';
	comment = '02, 3_456';
	match = '(\B\-|\b)(?<![^.]\.)[0-9][0-9_]*\b(?!\.[0-9])';
},
{	name = 'constant.numeric.integer.hexadecimal.swift';
	comment = '0x4, 0xF_7';
	match = '(\B\-|\b)(?<![^.]\.)0x\h[\h_]*\b(?!\.[0-9])';
},
{	name = 'invalid.illegal.numeric.other.swift';
	match = '(\B\-|\b)[0-9][\w.]*';
},