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如何用另一个列表中的项替换文本中的字符串列表?

string-matching regex c#

Daniel · 技术社区 · 6 年前

假设我有一个字符串列表{“boy”,“car”,“ball”}和一个文本“the boy self his car to buy a ball”。

给定另一个字符串列表{“dog”,“bar”,“bone”},我的目标是查找文本中第一个列表的所有匹配项,并将它们替换为第二个列表的字符串:

BEFORE: the [boy] sold his [car] to buy a [ball]
AFTER:  the [dog] sold his [bar] to buy a [bone]

我的第一个想法是使用regex,但我不知道如何将字符串列表关联到regex中,我不想编写aho corasick。

怎么做才是正确的?

另一个例子:

Text: aaa bbb abab aabb bbaa ubab
replacing {aa, bb, ab, ub} for {11, 22, 35, &x}

BEFORE: [aa]a [bb]b [ab][ab] [aa][bb] [bb][aa] [ub][ab]
AFTER:  [11]a [22]b [35][35] [11][22] [22][11] [&x][35]

2 回复 | 直到 6 年前

41686d6564 6 年前

如果您想使用regex,可以使用以下内容:

var findList = new List<string>() { "boy", "car", "ball" };
var replaceList = new List<string>() { "dog", "bar", "bone" };

// Create a dictionary from the lists or have a dictionary from the beginning.
var dictKeywords = findList.Select((s, i) => new { s, i })
                           .ToDictionary(x => x.s, x => replaceList[x.i]);

string input = "the boy sold his car to buy a ball";
// Construct the regex pattern by joining the dictionary keys with an 'OR' operator.
string pattern = string.Join("|", dictKeywords.Keys.Select(s => Regex.Escape(s)));

string output =
    Regex.Replace(input, pattern, delegate (Match m)
    {
        string replacement;
        if (dictKeywords.TryGetValue(m.Value, out replacement)) return replacement;
        return m.Value;
    });

Console.WriteLine(output);

输出:

那条狗卖掉酒吧买骨头

codeandcloud 6 年前

不需要使用regex, string.Replace 就够了

var input = "the boy sold his car to buy a ball";
var oldvalues = new List<string>() { "boy", "car", "ball" };
var newValues = new List<string>() { "dog", "bar", "bone" };
var output = input;
for (int i = 0; i < oldvalues.Count; i++)
{
    output = output.Replace(oldvalues[i], newValues[i]);
}
Console.WriteLine(output);

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