Iterate over array of strings and replace if exists

Question

I am trying to iterate over an array of strings and check/replace if any of the strings exist in the input string. Using LINQ, this is what i have so far.

string input = "/main/dev.website.com"
string[] itemsToIgnore = { "dev.", "qa.", "/main/" };
string website = itemsToIgnore
                    .Select(x => 
                           { x = input.Replace(x, ""); return x; })
                    .FirstOrDefault();

When i run this, nothing actually happens and my input string stays the same?

Maybe aggregate function is something you looking for. code.msdn.microsoft.com/LINQ-Aggregate-Operators-c51b3869 — dev hedgehog
– dev hedgehog, Commented Nov 18, 2013 at 20:48

Dmytro Rudenko · Accepted Answer · 2013-11-20 21:43:27Z

5

string website = itemsToIgnore
                   .Aggregate(input, (current, s) => 
                         current.StartsWith(s) ? current.Replace(s, string.Empty) : current);

and without Linq

foreach (var part in itemsToIgnore) 
{
  if (website.StartsWith(part))
  {
    website = website.Replace(part, string.Empty);
  }
}

edited Nov 20, 2013 at 21:43

answered Nov 18, 2013 at 20:48

Dmytro Rudenko

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10 Comments

Warz Over a year ago

How can i avoid with Replace matching on something like "should.", i only ever want to replace if i get an exact match with nothing in front.

Dmytro Rudenko Over a year ago

May you explain your wish with some example?

Warz Over a year ago

If i have the string "should." noticed the "." after the word "should", and my itemsToIgnore list looks for "d.", it will catch replace the string "should." as "shoul". I only want to replace with an empty string if there is nothing in front of the itemsToIgnore list

Dmytro Rudenko Over a year ago

I have made changes in answer for this case

Warz Over a year ago

So that fixed my problem but raises another issue. If my itemsToIgnore list equals {"d.", "red."}, and my input is "d.something.com", the StartsWith command returns false and doesn't replace it. Why is it ignoring my first item ?

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