正则表达式提供另一种强大的文本搜索和处理方式,对于正则表达式,不同语言有着不同的实现,JavaScript采用的Perl5的语法.对于极少数匹配模式是简单的全字符文本的情况,我们往往会采用indexOf这样的方法,但是多数情况下,匹配模式往往都更为复杂. 1.语法 1)在JavaScript中我们可以采用内建构造器RegExp()来创建正则表达式的对象: var re = new RegExp("j.*t") 2)当然除了使用RegExp对象,我们可以采用更为简便的正则文本标记法 v…
Two strings X and Y are similar if we can swap two letters (in different positions) of X, so that it equals Y. For example, "tars" and "rats" are similar (swapping at positions 0 and 2), and "rats" and "arts" are si…
You are given an array A of strings. Two strings S and T are special-equivalent if after any number of moves, S == T. A move consists of choosing two indices i and j with i % 2 == j % 2, and swapping S[i] with S[j]. Now, a group of special-equivalent…
这是悦乐书的第344次更新,第368篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第209题(顺位题号是893). You are given an array A of strings. Two strings S and T are special-equivalent if after any number of moves, S == T. A move consists of choosing two indices i and j with i % 2…
Two strings X and Y are similar if we can swap two letters (in different positions) of X, so that it equals Y. For example, "tars" and "rats" are similar (swapping at positions 0 and 2), and "rats" and "arts" are si…