6b986646d4
This is the last of the needed GNU expressions before we can unleash bsdgrep by default. \b is effectively an agnostic equivalent of \< and \>, while \B will match every space that isn't making a transition from nonchar -> char or char -> nonchar.
35 lines
709 B
Plaintext
35 lines
709 B
Plaintext
# BRE Quantifiers
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ab\?c b abc abc
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ab\+c b abc abc
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# BRE Branching
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abc\|de b abc abc
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a\|b\|c b abc a
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\(ab\|bc\) b abcd ab
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# ERE Backrefs
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(ab)\1 - ab
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(ab)\1 - abab abab
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\1(ab) C ESUBREG
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(a)(b)(c)(d)(e)(f)(g)(h)(i)\9 - abcdefghii abcdefghii
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# \w, \W, \s, \S (alnum, ^alnum, space, ^space)
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\w+ - -%@a0X- a0X
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\w\+ b -%@a0X- a0X
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\s+ - aSNTb SNT
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\s\+ b aSNTb SNT
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# Word boundaries (\b, \B, \<, \>, \`, \')
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# (is/not boundary, start/end word, start/end subject string)
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\babc\b & <abc> abc
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\<abc\> & <abc> abc
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\Babc\B & abc
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\B[abc]\B & <abc> b
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\B[abc]+ - <abc> bc
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\B[abc]\+ b <abc> bc
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\`abc & abc abc
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abc\' & abc abc
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\`abc\' & abc abc
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\`.+\' - abNc abNc
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\`.\+\' b abNc abNc
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(\`a) - Na
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(a\`) - aN
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(a\') - aN
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(\'a) - Na
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