More formally, you can determine a score for each possible alignment by adding points for matching characters and subtracting points for Spaces and mismatches.
如果要更正式些，您可以确定一个分数，为匹配的字符添加分数、为空格和不匹配的字符减去分数。
The similar_text function returns the number of matching characters of two strings.
函数的作用是：返回两个字符串中相匹配的字符数量。
Since regular expressions are used to operate on strings, we'll begin with the most common task: matching characters.
由于正则表达式常用于字符串操作，那我们就从最常见的任务：字符匹配下手。
If you want to express the matching characters by using a range instead of the characters themselves, you can use the hyphen (-) character to separate the starting and ending characters of the range.
如果希望使用范围而不是字符本身来表示匹配字符，则可以使用连字符(-)将范围中的开始字符和结束字符分开。
If you want to express the matching characters by using a range instead of the characters themselves, you can use the hyphen (-) character to separate the starting and ending characters of the range.
如果希望使用范围而不是字符本身来表示匹配字符，则可以使用连字符(-)将范围中的开始字符和结束字符分开。
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