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。
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