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This article mainly shows you "how to achieve regular expression matching", the content is easy to understand, clear, hope to help you solve doubts, the following let the editor lead you to study and learn "how to achieve regular expression matching" this article.

Given a string (s) and a character pattern (p). Implement support for'.' Matches the regular expression of'*'.

'.' Matches any single character.' * 'matches zero or more preceding elements.

The match should cover the entire string (s), not part of the string.

Description:

S may be empty and contain only lowercase letters from amurz.

P may be empty and contain only lowercase letters from Amurz, as well as characters. And *.

Example 1:

Enter:

S = "aa" p = "a"

Output: false

Explanation: "a" does not match the entire string "aa".

Example 2:

Enter:

S = "aa" p = "a*"

Output: true

Explanation:'* 'means to match zero or more preceding elements, that is, to match' a'. Therefore, repeat'a 'once and the string can be changed to "aa".

Example 3:

Enter:

S = "ab" p = ". *"

Output: true

Explanation: ". *" means to match zero or more ('*') any character ('.').

Example 4:

Enter:

S = "aab" p = "c*a*b"

Output: true

Explanation:'c 'can not be repeated,' a 'can be repeated. So you can match the string "aab".

Example 5:

Enter:

S = "mississippi" p = "mis*is*p*."

Output: false above is all the content of the article "how to match regular expressions". 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!

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