javascript - javascript中的 token 替换

Question

我需要实现的是

在字符串中查找模式，存储匹配项将匹配项替换为唯一标记，以便稍后可以将标记替换为之前找到的匹配项。

解释

例如我有一组模式

paterns = [/Mr\.\s/,/Mrs\.\s/];


stringSubject = "Mr. john is an expert. mrs. john is no less. mr. watson know this very well";

提取匹配后它可能看起来像(不区分大小写的匹配)

stringSubject = "{1} john is an expert. {2} john is no less. {3} watson know this very well";

token 数组可能看起来像

tokens = ["Mr.","mr.","mrs."]

stringSubject = "{1} john is an expert. {3} john is no less. {2} watson know this very well";

//处理stringSubject之后

token 被替换为

stringSubject = "Mr. john is an expert. mrs. john is no less. mr. watson know this very well";

这样即使在对匹配模式执行不区分大小写的操作后，也能按原样检索原始字符串。

如何使用正则表达式完成此操作？

Answer 1

这个怎么样？

var stringSubject = "Mr. john is...",
    patterns = [/Mr\.\s/, /Mrs\.\s/],
    currentTokenIndex = 0,
    tokens = [/* this is where the matches will be stored */];

for (var i = -1, l = patterns.length; ++i < l;) {
    stringSubject = stringSubject.replace(patterns[i], function(match){
        tokens[currentTokenIndex] = match;
        return '{' + currentTokenIndex++ + '}';
    });
}

stringSubject; // <= "{0}john is..."

// Later:
stringSubject = stringSubject.replace(/\{(\d+?)\}/g, function(match, index){
    return tokens[index];
});

stringSubject; // <= "Mr. john is..."