按顺序替换占位符

Question

I have a part of a URL like this:

/home/{value1}/something/{anotherValue}

Now i want to replace all between the brackets with values from a string-array.

I tried this RegEx pattern: \\{[a-zA-Z_]\\} but it doesn't work.

Later (in C#) I want to replace the first match with the first value of the array, second with the second.

Update: The /'s cant be used to separate. Only the placeholders {...} should be replaced.

Example: /home/before{value1}/and/{anotherValue}

String array: {"Tag", "1"}

Result: /home/beforeTag/and/1

I hoped it could works like this:

string input = @"/home/before{value1}/and/{anotherValue}";
string pattern = @"\{[a-zA-Z_]\}";
string[] values = {"Tag", "1"};

MatchCollection mc = Regex.Match(input, pattern);        
for(int i, ...)
{
    mc.Replace(values[i];
}        
string result = mc.GetResult;

Edit: Thank you Devendra D. Chavan and ipr101,

both solutions are greate!

Answer 1

You can try this code fragment,

// Begin with '{' followed by any number of word like characters and then end with '}'
var pattern = @"{\w*}"; 
var regex = new Regex(pattern);

var replacementArray = new [] {"abc", "cde", "def"};
var sourceString = @"/home/{value1}/something/{anotherValue}";

var matchCollection = regex.Matches(sourceString);
for (int i = 0; i < matchCollection.Count && i < replacementArray.Length; i++)
{
    sourceString = sourceString.Replace(matchCollection[i].Value, replacementArray[i]);
}

Answer 2

[a-zA-Z_] describes a character class. For words, you'll have to add * at the end (any number of characters within a-zA-Z_ .

Then, to have 'value1' captured, you'll need to add number support : [a-zA-Z0-9_]* , which can be summarized with: \\w*

So try this one : {\\w*}

But for replacing in C#, string.Split('/') might be easier as Fredrik proposed. Have a look at this too

Answer 3

You could use a delegate, something like this -

string[] strings = {"dog", "cat"};
int counter = -1;
string input = @"/home/{value1}/something/{anotherValue}";
Regex reg = new Regex(@"\{([a-zA-Z0-9]*)\}");
string result = reg.Replace(input, delegate(Match m) {
    counter++;
    return "{" + strings[counter] + "}";
});

Answer 4

My two cents:

// input string     
string txt = "/home/{value1}/something/{anotherValue}";

// template replacements
string[] str_array = { "one", "two" };

// regex to match a template
Regex regex = new Regex("{[^}]*}");

// replace the first template occurrence for each element in array
foreach (string s in str_array)
{
    txt = regex.Replace(txt, s, 1);
}

Console.Write(txt);