re.MatchObject.span() method returns a tuple containing starting and ending index of the matched string. If group did not contribute to the match it returns(-1,-1).
Syntax: re.MatchObject.span()
Parameters: group (optional) By default this is 0.
Return: A tuple containing starting and ending index of the matched string. If group did not contribute to the match it returns(-1,-1).
AttributeError: If a matching pattern is not found then it raises AttributeError.
Consider the below example:
Example 1:
Python3
# import libraryimport re """We create a re.MatchObject and store it in match_object variable, '()' parenthesis are used to define a specific group"""match_object = re.match(r'(\d+)', '128935') """ d in above pattern stands for numerical character+ is used to match a consecutive set of characters satisfying a given condition so d+ will match aconsecutive set of numerical characters""" # generating the tuple with the # starting and ending indexprint(match_object.span()) |
Output:
(0, 6)
It’s time to understand the above program. We use a re.match() method to find a match in the given string(‘128935‘) the ‘d‘ indicates that we are searching for a numerical character and the ‘+‘ indicates that we are searching for continuous numerical characters in the given string. Note the use of ‘()‘ the parenthesis is used to define different subgroups.
Example 2: If a match object is not found then it raises AttributeError.
Python3
# import libraryimport re """We create a re.MatchObject and store it in match_object variable,'()' parenthesis are used to define a specific group""" match_object = re.match(r'(\d+)', 'Lazyroar') """ d in above pattern stands for numerical character+ is used to match a consecutive set of characters satisfying a given condition so d+ will match aconsecutive set of numerical characters""" # generating the tuple with the# starting and ending indexprint(match_object.span()) |
Output:
Traceback (most recent call last):
File "/home/18a058de83529572f8d50dc9f8bbd34b.py", line 17, in
print(match_object.span())
AttributeError: 'NoneType' object has no attribute 'span'
