Given a string, find the first non-repeating character in it and return it’s index. If it doesn’t exist, return -1.
Examples:
s “leetcode” return 0.
s “loveleetcode”, return 2. Note: You may assume the string contain only lowercase letters.
…
下面的内容是一个 data1.txt 文本内容,里面记录了一些正则表达式的笔记
long long ago there is girl, shes name is little redhat..
long_long_long#long;long:long
This is a test txt...
my phone number is 18621735531There are a lot of good books,220123
…