Use [^A-Za-z0-9].
Note: removed the space since that is not typically considered alphanumeric.
Answer from Mirek Pluta on Stack OverflowGeeksforGeeks
geeksforgeeks.org › java › how-to-remove-all-non-alphanumeric-characters-from-a-string-in-java
How to remove all non-alphanumeric characters from a string in Java - GeeksforGeeks
July 15, 2025 - The string can be easily filtered using the ReGex [^a-zA-Z0-9 ]. Java · // Java program to remove non-alphanumeric // characters from a string class GFG { // Main driver method public static void main(String args[]) { // Input string String str1 = "@!Geeks-for'Geeks, 123"; str1 = ...
How to replace non-alphanumeric characters with " " in a String? - Oracle Forums
Hi, Anyone can help with this? I guess I should use the replaceAll-method?? More on forums.oracle.com
regex - Remove all non alphanumeric characters in Kotlin - Stack Overflow
How to get only the alphanumeric characters? ... String.replace searches for a literal string, while String.replaceAll searches for a regular expression. ... You have to create a regex object. Otherwise you're just replacing occurrences of the literal string [^A-Za-z0-9 ] which is obviously not in your input. ... Although my suggestion (replaceAll) would work in Java... More on stackoverflow.com
removing all non-letter characters from a string? ((using regex))
This is very simple with regex. You just need to replace non-words (/\W/ig). So: var string = "lakjsdlkasjdlsaj@£$%^&*klajdlaskjds"; string.replace(/\W/ig, ""); --> "lakjsdlkasjdlsajklajdlaskjds" \w == words, \W == non words. You don't need a loop here as we're using /g which stands for global, so we replace every instance. And just incase I'm using /i as well which ignores the case. As it's regex you can just do /ig and the selectors will stack to ignore case and global. My favorite regex visualiser lives here: https://jex.im/regulex/#!embed=false&flags=ig&re=%5CW More on reddit.com
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September 28, 2015Help split a string at all non alphanumeric characters
https://doc.rust-lang.org/std/primitive.str.html#method.split_inclusive It returns an iterator (which is typically what you want, for lazy evaluation), use .collect() to clone the items into a Vec. More on reddit.com
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March 22, 2022Baeldung
baeldung.com › home › java › java array › removing all non-alphabetic characters from string array in java
Removing All Non-alphabetic Characters From String Array in Java | Baeldung
November 18, 2024 - The first argument “[^a-zA-Z]” is a regex pattern that matches any character that isn’t a letter (uppercase or lowercase) while the second argument “” replaces those matched characters with an empty string, effectively removing them. ... @Test void givenMixedString_whenRemoveNonA...
GeeksforGeeks
geeksforgeeks.org › java › remove-all-non-alphabetical-characters-of-a-string-in-java
Remove all non-alphabetical characters of a String in Java - GeeksforGeeks
March 24, 2023 - The replaceAll method in the removeNonAlphabetic function uses regular expressions to replace non-alphabetic characters with an empty string.
Mkyong
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Java regex check non-alphanumeric string - Mkyong.com
November 8, 2020 - In Java, we can use regex `[^a-zA-Z0-9]` to match non-alphanumeric characters.
Brainly
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[FREE] How can we ignore all non-alphanumeric characters in Java? - brainly.com
To ignore all non-alphanumeric characters in Java, use the String.replaceAll() method with regex pattern [^a-zA-Z0-9], which effectively removes any character that is not a letter or a number from a given string, useful for cleaning data like email addresses.
Quora
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How to remove all non-alphanumeric characters from a string in Java - Quora
Answer: Here you go! Non-alphanumeric characters comprise of all the characters except alphabets and numbers. It can be punctuation characters like exclamation mark(!), at symbol(@), commas(, ), question mark(?), colon(:), dash(-) etc and special characters like dollar sign($), equal symbol(=), ...
Oracle
forums.oracle.com › ords › apexds › post › how-to-replace-non-alphanumeric-characters-with-in-a-string-2066
How to replace non-alphanumeric characters with " " in a String? - Oracle Forums
November 22, 2006 - Hi, Anyone can help with this? I guess I should use the replaceAll-method??
w3resource
w3resource.com › java-exercises › re › java-re-exercise-21.php
Java - Remove all non-alphanumeric characters from a string
March 16, 2026 - public class test { public static void main(String[] args) { String text ="Java Exercises"; System.out.println("Original string: "+text); System.out.println("After removing all non-alphanumeric characters from the said string: "+validate(text)); text ="Ex@^%&%(ercis*&)&es"; System.out.println("\nOriginal string: "+text); System.out.println("After removing all non-alphanumeric characters from the said string: "+validate(text)); } public static String validate(String text) { return text.replaceAll("(?i)[^A-Z]", ""); } }
Interview Kickstart
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Remove Non-Alphanumeric Characters from a String in Java
December 19, 2024 - Our regular expression will be: ... ‘0’ to ‘9’.” ... Here ^ Matches the beginning of the input: It means, “replace all substrings with pattern [^a-zA-Z0-9] with the empty string.”...
Java2Blog
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Remove Non-alphanumeric Characters in Python [3 Ways] - Java2Blog
November 10, 2023 - flag – It represents one or multiple regex flags, used to manipulate the pattern‘s standard behaviour. However, we used the first three parameters with the re.sub() method to replace all the occurrences of non-alphanumeric characters.
Top answer 1 of 10
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You need to create a regex object
var answer = "Test. ,replace"
println(answer)
answer = answer.replace("[^A-Za-z0-9 ]", "") // doesn't work
println(answer)
val re = Regex("[^A-Za-z0-9 ]")
answer = re.replace(answer, "") // works
println(answer)
Try it online: https://try.kotlinlang.org/#/UserProjects/ttqm0r6lisi743f2dltveid1u9/2olerk6jvb10l03q6bkk1lapjn
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The standard library of Kotlin is beautiful like this. Just use String.filter combined with Char.isLetterOrDigit, like this:
val stringToFilter = "A1.2-b3_4C"
val stringWithOnlyDigits = stringToFilter.filter { it.isLetterOrDigit() }
println(stringWithOnlyDigits) //Prints out "A12b34C"
Code Highlights
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How to Remove Non Alphanumeric Characters JavaScript for Cleaner Code | Code Highlights
September 30, 2024 - You can use different regular expressions to target specific characters. For example, /[^a-zA-Z0-9]/g removes anything that isn't a letter or number. In this example, we'll remove all non-alphanumeric characters from a string: ... Sometimes, you only want to keep numeric values.
Bobby Hadz
bobbyhadz.com › blog › javascript-remove-non-alphanumeric-characters-from-string
Remove all non-alphanumeric Characters from a String in JS | bobbyhadz
The replace() method will remove all non-alphanumeric characters from the string by replacing them with empty strings.
Quick Adviser
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Codegrepper
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javascript replace all non alphanumeric characters Code Example
August 25, 2020 - input.replace(/\W/g, '') //doesnt include underscores input.replace(/[^0-9a-z]/gi, '') //removes underscores too
Codegrepper
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regex remove all non alphanumeric characters javascript Code Example
July 22, 2022 - input.replace(/\W/g, '') //doesnt include underscores input.replace(/[^0-9a-z]/gi, '') //removes underscores too
Py4u
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Code Redirect
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Replacing all non-alphanumeric characters with empty strings - Code Redirect
Note: removed the space since that is not typically considered alphanumeric. ... The solutionof MC ND works, but it's really slow (Needs ~1second for the small test sample). This is caused by the echo "!_buf!"|findstr ... construct, as for each character the pipe creates two instances of cmd.exe and starts findstr.