resharp 0.5.1

high-performance regex engine with intersection and complement operations
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131

description = '''
expected internal representation
'''

[[test]]
name = 'foo_anch'
pattern = '^_*foo_*$'
pp = "_*foo_*"

[[test]]
pattern = 'a(?!b).*(?<!a)b'
pp = '❮a(?=~(b_*)\z){∅}❮.*❯❯(?<=(\A|[^a]))b'

[[test]]
pattern = 'aa(?!a) *'
pp = 'aa(?=~(a_*)\z){∅}❮ *❯'

[[test]]
pattern = '\s'
pp = '[\t-\r ]'

[[test]]
name = 'anchor_line_star'
pattern = '^abc.*$'
pp = '(?<=_*(\A|\n))abc.*(?=(\z|\n)_*)'
ts_rev = '_*cba(?=(\z|\n)_*)'

[[test]]
name = 'anchor_line_literal'
pattern = '^abc$'
pp = '(?<=_*(\A|\n))abc(?=(\z|\n)_*)'
ts_rev = '_*(\A|\n)cba(?=(\z|\n)_*)'

[[test]]
name = 'anchor_line_digit_star'
pattern = '^\d+$'
pp = '(?<=_*(\A|\n))[0-9]+(?=(\z|\n)_*)'
ts_rev = '_*(\A|\n)[0-9]*[0-9](?=(\z|\n)_*)'

[[test]]
name = 'anchor_line_star_leading'
pattern = '^.*abc$'
pp = '(?<=_*(\A|\n)).*abc(?=(\z|\n)_*)'
ts_rev = '_*(\A|\n)cba.*(?=(\z|\n)_*)'

[[test]]
name = 'neg_la'
pattern = '(?!a).'
pp = '[^\na]'




[[test]]
name = 'neg_la_single_byte'
pattern = 'b(?!a)'
pp = 'b(?=~(a_*)\z)'
ts_rev = '(\Ab|_*[^a]b)'

[[test]]
name = 'neg_la_ascii_word_class'
pattern = 'x(?![a-zA-Z0-9_])'
pp = 'x(?=~([0-9A-Z\_a-z]_*)\z)'
ts_rev = '(\Ax|_*[^0-9A-Z\_a-z]x)'

[[test]]
name = 'end_anchor_then_literal'
pattern = '\za'
pp = '⊥'

[[test]]
name = 'end_anchor_then_literal_after_prefix'
pattern = 'a\zb'
pp = '⊥'

[[test]]
name = 'end_anchor_then_class'
pattern = '\z[abc]'
pp = '⊥'

[[test]]
name = 'la_peel_drop'
pattern = '(?=a).'
pp = 'a'

[[test]]
name = 'la_peel_unsat_single'
pattern = '(?=a)b'
pp = '⊥'

[[test]]
name = 'la_peel_unsat_two'
pattern = '(?=ab)cd'
pp = '⊥'

[[test]]
name = 'la_peel_cascade_full'
pattern = '(?=abc)...'
pp = 'abc'

[[test]]
name = 'la_peel_partial'
pattern = '(?=a)..'
pp = 'a.'

[[test]]
name = 'la_peel_class_intersect'
pattern = '(?=[ab])[bc]'
pp = 'b'

[[test]]
name = 'la_peel_class_disjoint'
pattern = '(?=[ab])[cd]'
pp = '⊥'

[[test]]
name = 'la_peel_neg'
pattern = '$STRING:string'
pp = '⊥'


# `(?!b)(.*)` simplifies to a Lookahead with body=`~(b_*)\z` and tail=`.*`,
# rel=u32::MAX. The body asserts "next does not start with b" and is
# zero-width; the `.*` is carried as the lookahead's tail. Bug: at runtime
# this Lookahead is treated as nullable in CENTER irrespective of whether
# the assertion holds, so `(and|AND)\b(.*)` over `xxxxxANDyyyyy` yields a
# spurious match (\b fails between D and y but a match is reported).
[[test]]
name = 'neg_la_then_dotstar'
pattern = 'a(?!b)(.*)'
pp = 'a(?=~(b_*)\z){∅}❮.*❯'