[3.10] pythonGH-98906 re module: search() vs. match() section should mention fullmatch() (pythonGH-98916) (pythonGH-99913)

pythonGH-98906 ```re``` module: ```search() vs. match()``` section should mention ```fullmatch()``` (pythonGH-98916)

Mention fullmatch along with search and match.
(cherry picked from commit e0f91de)

Co-authored-by: ram vikram singh <[email protected]>

Co-authored-by: ram vikram singh <[email protected]>

Author: miss-islington

Doc/library/re.rst

@@ -1471,16 +1471,22 @@ search() vs. match()
 
 .. sectionauthor:: Fred L. Drake, Jr. <[email protected]>
 
-Python offers two different primitive operations based on regular expressions:
-:func:`re.match` checks for a match only at the beginning of the string, while
-:func:`re.search` checks for a match anywhere in the string (this is what Perl
-does by default).
+Python offers different primitive operations based on regular expressions:
+
++ :func:`re.match` checks for a match only at the beginning of the string
++ :func:`re.search` checks for a match anywhere in the string
+  (this is what Perl does by default)
++ :func:`re.fullmatch` checks for entire string to be a match
+
 
 For example::
 
    >>> re.match("c", "abcdef")    # No match
    >>> re.search("c", "abcdef")   # Match
    <re.Match object; span=(2, 3), match='c'>
+   >>> re.fullmatch("p.*n", "python") # Match
+   <re.Match object; span=(0, 6), match='python'>
+   >>> re.fullmatch("r.*n", "python") # No match
 
 Regular expressions beginning with ``'^'`` can be used with :func:`search` to
 restrict the match at the beginning of the string::
@@ -1494,8 +1500,8 @@ Note however that in :const:`MULTILINE` mode :func:`match` only matches at the
 beginning of the string, whereas using :func:`search` with a regular expression
 beginning with ``'^'`` will match at the beginning of each line. ::
 
-   >>> re.match('X', 'A\nB\nX', re.MULTILINE)  # No match
-   >>> re.search('^X', 'A\nB\nX', re.MULTILINE)  # Match
+   >>> re.match("X", "A\nB\nX", re.MULTILINE)  # No match
+   >>> re.search("^X", "A\nB\nX", re.MULTILINE)  # Match
    <re.Match object; span=(4, 5), match='X'>