regexp/pattern_readings_no_parens.rb

tests/_examples/regexp/pattern_readings_no_parens.rb in the metorex repository.

# What a pattern says about itself, and the text a pattern is written from.
p Regexp.escape("\*?{}.+^$[]()- ")
p Regexp.escape("\n\r\f\t")
p Regexp.escape("abc").encoding
p Regexp.quote("a.b")

folded = /(?i:nothing)/
p folded.to_s
folding = /abc/i
plain = /abc/
p folding.to_s
p plain.to_s

terminator = %r@\@@
p terminator.source
p %r+\++.source

ascii_only = /[\u{20}-\u{7E}]/
wider = /[\u{20}-\u{7EE}]/
p ascii_only.source.encoding
p wider.source.encoding

p Regexp.try_convert(/foo/)
p Regexp.try_convert("foo")

p Regexp.linear_time?(/a/)
p Regexp.linear_time?(/(a)\1/)
p [Regexp::IGNORECASE, Regexp::EXTENDED, Regexp::MULTILINE]

p Regexp.new("").frozen?
literal = /ab/
p literal.frozen?
p %s{foo bar}

Output:

"\\*\\?\\{\\}\\.\\+\\^\\$\\[\\]\\(\\)\\-\\ "
"\\n\\r\\f\\t"
#<Encoding:US-ASCII>
"a\\.b"
"(?i-mx:nothing)"
"(?i-mx:abc)"
"(?-mix:abc)"
"@"
"\\+"
#<Encoding:US-ASCII>
#<Encoding:UTF-8>
/foo/
nil
true
false
[1, 2, 4]
false
true
:"foo bar"