Waits until IO
is writable and returns true
or false
when times out.
Returns an array of the values associated with each specified key.
Deserializes JSON
string by constructing new Regexp
object with source s
(Regexp
or String
) and options o
serialized by to_json
The first form returns the MatchData
object generated by the last successful pattern match. Equivalent to reading the special global variable $~
(see Special global variables in Regexp
for details).
The second form returns the nth field in this MatchData
object. n can be a string or symbol to reference a named capture.
Note that the last_match
is local to the thread and method scope of the method that did the pattern match.
/c(.)t/ =~ 'cat' #=> 0 Regexp.last_match #=> #<MatchData "cat" 1:"a"> Regexp.last_match(0) #=> "cat" Regexp.last_match(1) #=> "a" Regexp.last_match(2) #=> nil /(?<lhs>\w+)\s*=\s*(?<rhs>\w+)/ =~ "var = val" Regexp.last_match #=> #<MatchData "var = val" lhs:"var" rhs:"val"> Regexp.last_match(:lhs) #=> "var" Regexp.last_match(:rhs) #=> "val"
Returns true if sym
starts with one of the prefixes
given. Each of the prefixes
should be a String
or a Regexp
.
:hello.start_with?("hell") #=> true :hello.start_with?(/H/i) #=> true # returns true if one of the prefixes matches. :hello.start_with?("heaven", "hell") #=> true :hello.start_with?("heaven", "paradise") #=> false
Return the path as a String
.
to_path
is implemented so Pathname
objects are usable with File.open
, etc.
Returns true for IPv4 private address (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16). It returns false otherwise.
Returns true for IPv4-compatible IPv6 address (::/80). It returns false otherwise.
Returns the socket path as a string.
Addrinfo.unix("/tmp/sock").unix_path #=> "/tmp/sock"
Returns the size of the most recent match in bytes, or nil
if there was no recent match. This is different than matched.size
, which will return the size in characters.
s = StringScanner.new('test string') s.check /\w+/ # -> "test" s.matched_size # -> 4 s.check /\d+/ # -> nil s.matched_size # -> nil
Returns the pre-match
(in the regular expression sense) of the last scan.s = StringScanner.new('test string') s.scan(/\w+/) # -> "test" s.scan(/\s+/) # -> " " s.pre_match # -> "test" s.post_match # -> "string"
Returns the post-match
(in the regular expression sense) of the last scan.s = StringScanner.new('test string') s.scan(/\w+/) # -> "test" s.scan(/\s+/) # -> " " s.pre_match # -> "test" s.post_match # -> "string"
Returns the subgroups in the most recent match at the given indices. If nothing was priorly matched, it returns nil.
s = StringScanner.new("Fri Dec 12 1975 14:39") s.scan(/(\w+) (\w+) (\d+) /) # -> "Fri Dec 12 " s.values_at 0, -1, 5, 2 # -> ["Fri Dec 12 ", "12", nil, "Dec"] s.scan(/(\w+) (\w+) (\d+) /) # -> nil s.values_at 0, -1, 5, 2 # -> nil
Creates GUID.
WIN32OLE.create_guid # => {1CB530F1-F6B1-404D-BCE6-1959BF91F4A8}