[DOC] Reword "Regular Expression" to "Matched Data"

`$~` and its accessors are related to regular expressions, but are not
themselves.

Author: nobu

doc/language/globals.md

@@ -19,7 +19,7 @@ require 'English'
 |   `$!`   |   `$ERROR_INFO`   | \Exception object or `nil`             |   `nil`   |    Yes    | Kernel#raise |
 |   `$@`   | `$ERROR_POSITION` | \Array of backtrace positions or `nil` |   `nil`   |    Yes    | Kernel#raise |
 
-### Regular Expression
+### Matched Data
 
 |   Variable    |      \English       | Contains                          | Initially | Read-Only | Reset By        |
 |:-------------:|:-------------------:|-----------------------------------|:---------:|:---------:|-----------------|
@@ -127,7 +127,7 @@ Output:
 
 English - `$ERROR_POSITION`.
 
-## Regular Expression
+## Matched Data
 
 These global variables store information about the most recent
 successful match in the current scope.

doc/string/partition.rdoc

@@ -17,7 +17,7 @@ Note that in the examples below, a returned string <tt>'hello'</tt>
 is a copy of +self+, not +self+.
 
 If +pattern+ is a Regexp, performs the equivalent of <tt>self.match(pattern)</tt>
-(also setting {pattern-matching global variables}[rdoc-ref:language/globals.md@Regular+Expression]):
+(also setting {matched-data variables}[rdoc-ref:language/globals.md@Matched+Data]):
 
   'hello'.partition(/h/)  # => ["", "h", "ello"]
   'hello'.partition(/l/)  # => ["he", "l", "lo"]
@@ -30,7 +30,7 @@ If +pattern+ is a Regexp, performs the equivalent of <tt>self.match(pattern)</tt
 
 If +pattern+ is not a Regexp, converts it to a string (if it is not already one),
 then performs the equivalent of <tt>self.index(pattern)</tt>
-(and does _not_ set {pattern-matching global variables}[rdoc-ref:language/globals.md@Regular+Expression]):
+(and does _not_ set {matched-data global variables}[rdoc-ref:language/globals.md@Matched+Data]):
 
   'hello'.partition('h')     # => ["", "h", "ello"]
   'hello'.partition('l')     # => ["he", "l", "lo"]

doc/string/rpartition.rdoc

@@ -23,7 +23,7 @@ The pattern used is:
 Note that in the examples below, a returned string <tt>'hello'</tt> is a copy of +self+, not +self+.
 
 If +pattern+ is a Regexp, searches for the last matching substring
-(also setting {pattern-matching global variables}[rdoc-ref:language/globals.md@Regular+Expression]):
+(also setting {matched-data global variables}[rdoc-ref:language/globals.md@Matched+Data]):
 
   'hello'.rpartition(/l/)     # => ["hel", "l", "o"]
   'hello'.rpartition(/ll/)    # => ["he", "ll", "o"]
@@ -36,7 +36,7 @@ If +pattern+ is a Regexp, searches for the last matching substring
 
 If +pattern+ is not a Regexp, converts it to a string (if it is not already one),
 then searches for the last matching substring
-(and does _not_ set {pattern-matching global variables}[rdoc-ref:language/globals.md@Regular+Expression]):
+(and does _not_ set {matched-data global variables}[rdoc-ref:language/globals.md@Matched+Data]):
 
   'hello'.rpartition('l')     # => ["hel", "l", "o"]
   'hello'.rpartition('ll')    # => ["he", "ll", "o"]