cpp-flashcards/org/study_deck_02/dsa/2-d-dynamic-programming/0010-regular-expression-matching.org

#+ANKI_DECK: study_deck_02
* TODO 0010. Regular Expression Matching :hard:
:PROPERTIES:
:NEETCODE: [[file:../../roadmap.org::*0010. Regular Expression Matching][0010. Regular Expression Matching]]
:END:

Given an input string ~s~ and a pattern ~p~, implement regular expression matching with support for ~'.'~ and ~'*'~ where:

 - ~'.'~ Matches any single character.​​​​

 - ~'*'~ Matches zero or more of the preceding element.

Return a boolean indicating whether the matching covers the entire input string (not partial).

*Example 1:*


#+begin_src
Input: s = "aa", p = "a"
Output: false
Explanation: "a" does not match the entire string "aa".
#+end_src


*Example 2:*


#+begin_src
Input: s = "aa", p = "a*"
Output: true
Explanation: '*' means zero or more of the preceding element, 'a'. Therefore, by repeating 'a' once, it becomes "aa".
#+end_src


*Example 3:*


#+begin_src
Input: s = "ab", p = ".*"
Output: true
Explanation: ".*" means "zero or more (*) of any character (.)".
#+end_src


*Constraints:*

 - ~1 <= s.length <= 20~

 - ~1 <= p.length <= 20~

 - ~s~ contains only lowercase English letters.

 - ~p~ contains only lowercase English letters, ~'.'~, and ~'*'~.

 - It is guaranteed for each appearance of the character ~'*'~, there will be a previous valid character to match.

** TODO Approach
Write your approach here.

** TODO Python
#+begin_src python
class Solution:
    def isMatch(self, s: str, p: str) -> bool:
#+end_src

** TODO C++
#+begin_src cpp
class Solution {
public:
    bool isMatch(string s, string p) {
        
    }
};
#+end_src