How can I remove all instances of a string within a string inside a list?

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I have this code:

phraseSources.ToList().ForEach(i => i.JmdictMeaning ?? );

What I need to do, and I'm not it's possible using LINQ, is to remove all occurrences of a string looking like this:

[see=????????]

Note the ??? is meant to indicate there can be any amount of characters, except "]".

That appear inside of JmDictMeaning. Note there might be one or more of these but they will always start with "[see=" and end with "]"

In order to remove all [see=...] patterns you can try Regex.Replace:

  using System.Text.RegularExpressions;

  ...

  // Add ", RegexOptions.IgnoreCase" if required (if "See", "SEE" should be matched)
  Regex regex = new Regex(@"\[see=[^\]]*\]");

  // "abc[see=456]789" -> "abc789"
  var result = regex.Replace(source, "");

In your case:

  Regex regex = new Regex(@"\[see=[^\]]*\]"); 

  var list = phraseSources.ToList();

  list.ForEach(item => item.JmdictMeaning = regex.Replace(item.JmdictMeaning, ""));

Same idea if you want to filter out items with such strings:

  var result = phraseSources
    .Where(item => !regex.IsMatch(item.JmdictMeaning))
    .ToList();

Python, Python | Count String occurrences in mixed list · Python - Extract elements with Range consecutive occurrences. manjeet_04. Check out this Author's contributed​  Strings are immutable in Python, which means once a string is created, you cannot alter the contents of the strings. If at all, you need to change it, a new instance of the string will be created with the alterations. Having that in mind, we have so many ways to solve this. Using str.replace, >>> "it is icy".replace("i", "") 't s cy'

phraseSources.ToList().RemoveAll(i => i == "xyz");

Yours I imagine would probably look something like

phraseSources.ToList().RemoveAll(i => i.StartsWith("[see=") && i.EndsWith("]"));

Here's an example dotnetfiddle showing it in action

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You can remove like this:

phraseSources.Select(ph => {ph.JmdictMeaning.Replace("[see=????????]", ""; return ph;})
    .ToList();

Let me show an example:

public class Person
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

and query should look like this:

IList<Person> persons = new List<Person>()
{
    new Person(){FirstName = "one1[see=????????]", LastName = "LastName1" },
    new Person(){FirstName = "two1[see=????????]", LastName = "LastName1" },
    new Person(){FirstName = "three1", LastName = "LastName1" },
    new Person(){FirstName = "one[see=????????]", LastName = "LastName1" },
    new Person(){FirstName = "two", LastName = "LastName1" },
};

persons = persons.Select(p => { p.FirstName = p.FirstName.Replace("[see=????????]", ""); 
    return p; })
    .ToList();

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Comments
  • Could you provide some sample data and expect result?
  • Two things to be aware of: ToList will create a copy of a source string list, and ForEach will not modofy the list in-place. So you're "modifying" a copy of a copy of each string.
  • Thanks Dmitry, I will leave mark your answer as correct in a while as leaving the question open will allow more people to see and upvote your very good answer.
  • @Alan2: It would be more polite for others if you mark the answer correct as soon as you're sure it's correct, so people can focus their energies helping other people with questions.
  • RemoveAll doesn't return the list, and .ToList() creates a copy, so this code will create a copy, modify that copy, and then throw that copy away.
  • I'm sorry, the ?? is just meant to indicate there can be any string there.
  • @Alan2 please, see my updated answer