在正则表达式搜索 C# 中插入字符串

Question

How I can write this:

List<string> Words= new List<string>();

Regex re = new Regex(@"\b" + Words[n] + "\b");

My exactly question is how I can search elements from list or string using regex?

Answer 1

Possible Solution:

string testString = "cat and dog";
string[] Words = { "cat", "dog" };

foreach(string word in Words)
{
    bool contains = Regex.IsMatch(testString, "\\b" + word + "\\b");
}

Answer 2

You can use all words in one regex:

var words= new List<string>();
var regex = new Regex(string.Format(@"\b(?:{0})\b", string.Join("|", words)), RegexOptions.Compiled);

Answer 3

This will give you a list of string regex patterns:

List<string> words= new List<string>() { "cat", "dog" };

List<string> regexPatterns = words.Select(str => "\\b" + str + "\\b").ToList();

Or if you want a list of Regex objects:

List<Regex> regexObjects = words.Select(str => new Regex("\\b" + str + "\\b")).ToList();