What is the meaning of grouping in python regular expressions

I would like to share with you what grouping in python regular expressions means. I believe most people don't know much about it, so share this article for your reference. I hope you will gain a lot after reading this article. Let's learn about it together.

1. By adding parentheses to the regular expression, you can group the matching strings to separate our matching strings.

Multiple sets of left parentheses are numbered from left to right, starting with 1.

2. Grouping simplifies the regular expression and can refer to the grouping itself in the regular expression.

The right side of the grouping can refer to the substrings matched by the grouping by its number. And we can regard the grouping as a whole, and the quantifier can be added after the grouping, and the scope of the quantifier is the whole grouping.

Example

Import rem = "([1-9])\ d *) ([a Murz] {2})" r = re.match (m, "3780qp") if r! = None: print (r.groups ()) # > > ('3780mm,' 3' 'qp') print (r.group (0)) # > > 3780qp print (r.group (1)) # > > 3780 print (r.group (2)) # > > 3 print (r.group (3)) # > > qp#r.group (0) is equivalent to r.group () and above is all the content of the article "what does grouping in python regular expressions mean?" Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!