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
Remove all occurrences of a character in a string, Given a string. Write a program to remove all the occurrences of a character in the string. Examples: Input : s = "geeksforgeeks" c = 'e' Output : s = "gksforgks" Optionally you can also replace all its occurrences with a different string. Still after 5 years (at time of writing) the use of this tool against a Wordpress installation is effective and much easier in my opinion than using a mysql dump (although you might want to create a dump as well before running the script for backup purposes).
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();
Python Remove Character from String, Sometimes we want to remove all occurrences of a character from a string. Python string translate() function replace each character in the string using the newStr = erase (str,match) deletes all occurrences of match in str. The erase function returns the remaining text as newStr. If match is a string array or a cell array of character vectors, then erase deletes every occurrence of every element of match in str . The str and match arguments do not need to be the same size.
5 Ways to Remove a Character from String in Python, The following methods are used to remove a specific character from a string. In this method, we have to run a loop and append the characters and build a new string from the removes all occurrences of 'e' In this technique, every element of the string is converted to an equivalent element of a list, after which each of static String replaceEachRepeatedly (String text, String [] searchList, String [] replacementList) Replaces all occurrences of Strings within another String. static String replaceOnce (String text, String searchString, String replacement) Replaces a String with another String inside a larger String, once.
removeAll(where:), The order of the remaining elements is preserved. This example removes all the vowels from a string: var phrase = "The rain in Function REMOVETEXTS (strInput As String, rngFind As Range) As String Dim strTemp As String Dim strFind As String strTemp = strInput For Each cell In rngFind strFind = cell.Value strTemp = Replace (strTemp, strFind, "") Next cell REMOVETEXTS = strTemp End Function Copy and paste this table into cell A1 in Excel
Replace or remove all occurrences of a string, S = "replace both x and x with a y", re:replace(S, "x", "y", [global, {return, list}]). Java[edit]. Java has a built in function for replacing all occurrences Returns a new string in which all occurrences of a specified string in the current instance are replaced with another specified string. Replace(String, String, StringComparison) Returns a new string in which all occurrences of a specified string in the current instance are replaced with another specified string, using the provided comparison type.
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, andForEach
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