Removing an element from list if it contains particular text in it

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I have a C# method in which I look for certain text say username in a list with element in the format username + datetime and if any part of text matches the element in the list, then the entire element has to be removed from the list

Method to add to the c# List

string active_user = model.UserName.ToString();
string datetime = "(" + DateTime.Now + ")";
List<string> activeUsers = new List<string>();

if (activeUsers.Any(str => str.Contains(active_user)))
{
    //do nothing
}
else
{
    activeUsers.Add(active_user+datetime);
}

Now I would like a method that deletes the element if it matches the username or any part of element something like

if (activeUsers.Contains(active_user))
{
    activeUsers.Remove(active_user);
}

While the other answers are correct, you should note that they will delete any matches. For example, active_user = "John" will remove "John", "John123", "OtherJohn", etc.

You can use regular expressions to test, or if user names don't have parentheses, do your test like this:

string comp = active_user + "(";     // The ( is the start of the date part
activeUsers.RemoveAll(u => u.StartsWith(comp));

Also note, this is case sensitive.

How to delete an item in a list if it exists?, python list. I am getting new_tag from a form text field with self.response.get("​new_tag") and selected_tags from checkbox fields with You can use filter to remove elements from the list: Can your list contain more than one? Adding this answer for completeness, though it's only usable under certain conditions. The list before element removal is : [1, 4, 5, 4, 5] The list after element removal is : [1, 5] Method #3 : Using Lambda Function + filter () Lambda functions have always been a useful utility and hence can be used to perform tough task in just 1 liners. These can also perform this particular task.


You can do something like

activeUsers.RemoveAll(u => u.Contains(active_user));

That will match and remove all elements of activeUser that contain the text in active_user.

Python, Given a list, the task is to remove all those elements from list which contains the specific digits. Examples: Input: lst = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 13, 15,​  Now I want to delete the line of the List<string> myList where the line is same to the Content of the selected item. Edit: Solution by Flow Flow OverFlow int index = companies.IndexOf(companyContent); companies.RemoveAt(index);


var user = activeUsers.FirstOrDefault(au => au.Contains(active_user);

if(user != null)
    activeUsers.Remove(user);

if you are only wanting to remove the first match, else :

var users = activeUsers.Where(au => au.Contains(active_user);

foreach(var user in users)
    activeUsers.Remove(user);

Or more simply, the RemoveAll method Eric answered with.

C#, It contains well written, well thought and well explained computer science and How to Execute C# Program on cmd (command-line)? · How to Read and Write a Text File in C#? List.Remove(T) Method is used to remove the first occurrence of a specific Note: This method returns False if item was not found in the List. In this article we will discuss different ways to remove an elements from list. Python’s list provides a member function to remove an element from list i.e. It removes the first occurrence of given element from the list. Suppose we have a list of numbers i.e. Let’s remove 56 from the given list using list.remove () i.e.


If i Want to remove Numeric String Values List Items from my List

 List<ModelName> ModelList = new List<ModelName>();

 var regex = new Regex(@"\d");

 foreach(var item in ModelList.ToList())
                {
                    if (regex.IsMatch(item.PropertyName))
                    {
                        ModelList.RemoveAll(t => t.PropertyName== item.PropertyName);//Or
                        ModelList.RemoveAll(t => t.PropertyName.Contains(item.PropertyName));//Or You Can Use Contains Method
                    }
                }

 return ModelList;

This will remove all items from list those having Numeric values as a string and return only Character String in List items

Remove All Occurrences of a Specific Value from a List, For the sake of readability, we use a custom list(int…) method in the tests, which returns an ArrayList containing the elements we passed. This will only work if you want to compare exact strings. It will not work in case you want to check if the column string contains any of the strings in the list. The right way to compare with a list would be : searchfor = ['john', 'doe'] df = df[~df.col.str.contains('|'.join(searchfor))]


Remove Elements From Lists | Python List remove() Method, Arrays contain elements of the same data types, whereas Python lists If the particular item to be removed is not found, then a ValueError is  myList.Contains() does not return true, since it will check for if a whole element of the list matches the string I specified. myList.IndexOf() will not find an occurrence, since, as it is the case again, it will check for an element matching the string.


C# List Remove Examples, But we may also use RemoveAt to remove an element at an index. Remove example. C# program that uses Remove on List using System; using System.​Collections. RemoveRange. This can remove elements in a certain series of indexes. The List now contains only two strings: "dot" and "perls". VarString Literal. The remove() function uses the list element as the argument to delete. You have to pass only the single element which you want to delete. The function requires only one element and can delete the only single element from the list. Use the list variable concatenated with the remove() to remove the list element.


removeAll(where:), Use this method to remove every element in a collection that meets particular removeAll(where: { vowels.contains($0) }) // phrase == "Th rn n Spn stys mnly n  and want to search for items that contain the string 'abc'. would check if 'abc' exists in the list but it is a part of 'abc-123' and 'abc-456', 'abc' does not exist on its own. So how can I get all items that contain 'abc' ? I have to check if one item is in an array of 6 elements. Is it quicker to do 6 "if" or is it the same?