#1590Hard· asked at 18 companies
Regular Expression Matching
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What we know
Example 1
Input: s = "aa", p = "a" Output: false
Example 2
Input: s = "aa", p = "a*" Output: true
'*' lets 'a' repeat, so "a*" can match "aa".
Example 3
Input: s = "ab", p = ".*" Output: true
".*" means zero or more of any character.
Constraints
- •
1 <= s.length <= 20 - •
1 <= p.length <= 20 - •
scontains only lowercase letters;pcontains lowercase letters, '.' and '*'. - •
Every '*' is preceded by a valid character.