Java String Replace Special Characters. Cats are very popular. "; String regex = "(?i)cat";

Cats are very popular. "; String regex = "(?i)cat"; System. , the dot in `file. May 4, 2010 · How can I replace the string in Java? E. Because we want to be able to do more than simply replace each regex match with the exact same text, we need to reserve certain characters for special use. Oct 15, 2015 · Save this question. So far I have code which works but all special characters are ignored. '), "", $rs["hq_tel"])?> this is a string replace function that take array of chars and replace them if find any of the char in string. Feb 2, 2024 · This article explains replaceAll, replace, and replaceFirst methods that can be used to replace multiple characters in a string. Please let me know what is wrong with these statements. We would like to show you a description here but the site won’t allow us. But in regular expressions, the backslash is also an escape character. For example InputString -> Hi <Nishanth> How &are you ! OutputString -> Hi & Jan 4, 2020 · 4 How to remove special characters from a string? 5 When is searching and replacing special characters useful? 6 Are there any special characters that cannot be replaced in SQL? 7 How to use replace all occurrences with space characters? 8 How to replace all instances of a string? 9 How to replace all instances of Foo in JavaScript? Mar 12, 2016 · Java's string replace methods are very poorly named. I did a method that is consists of message = message. Case mapping is based on the Unicode Standard version specified by the Character class. Getting Characters and Substrings by Index You can get the character at a particular index within a string by invoking the charAt() accessor method. The pattern can be a string or a RegExp, and the replacement can be a string or a function called for each match. Feb 16, 2024 · Whether you are a beginner starting Java programming or an experienced looking to brush up on your Java skills, this tutorial will provide you with a deep understanding of the replace function and its uses in Java. csv. Feb 19, 2025 · Learn how to replace characters and substrings in Java using replace(), replaceAll(), and replaceFirst(). replace () method This method returns a new string resulting from replacing all occurrences of old characters in the string with new characters. replace () String. Jan 9, 2026 · The most basic replacement string consists only of literal characters. We will learn how to clean this and replace it with spaces. With this technique, you can define the replacement characters for the target characters. For eg, Input string = "ja*va st&ri%n@&" Expected o/p = " Definition and Usage The replace() method searches a string for a specified character, and returns a new string where the specified character (s) are replaced. Mar 8, 2020 · As \ is a special character in Java strings, it’s escaped with another \. 2. g. remember as the first arg of String. It is because a typical string in itself is a regex. The original string is left unchanged. Remove special characters using Java 1. But I want to convert the string into a string which will have only alphanumerical letters. For example, if the given string is “Hello @ World” then the output will be “Hello World”. replace () with Character This method accepts the oldChar and newChar, then replaces all the oldChar in the given string literal with the newChar and returns a resultant String object. Based on different scenarios we may need to create a regex pattern based on a given string. Escaping Characters in replaceAll () The replaceAll() method can take a regex or a typical string as the first argument. The replacement string replacement simply replaces each regex match with the text replacement. I scan the lines of the text and then each word in the text So to remove all the spaces in my string. String concatenation is implemented through the StringBuilder (or StringBuffer) class and its append method. Show activity on this post. You might also want to look into using regular expressions (as pointed out in edwga's answer), so that you can shorten those 5 function calls into one: Jul 11, 2018 · I have one String in java with special characters like this String string = "Report created with id: [2748], generator:file, filename:C:\Users\username\AppData\Local\Temp\UnitTestEncryption. Cats are very easy to love. We’ll explore removing and/or replacing a substring using a String API, then using a StringBuilder API and finally using the StringUtils class of Apache Commons library. I am doing it as: String str = &quot;45,%$^ Sharma%$&amp;^,is,4 Learn how to encode strings to replace special characters using built-in functions in programming languages. In this tutorial, we will learn two methods by which we can remove special characters from a String in Java. out. Oct 29, 2020 · I want to convert all the special characters in a String to their full names. Using Java, I want to go through the lines of a text and replace all ampersand symbols (&amp;) with the XML entity reference &amp;amp;. Feb 10, 2016 · I want to remove special characters like: - + ^ . *", "Universita"); but it replace all the string with the word ''Universita" and it isn't what i want. I tryed solutions like stringToReplace. Nov 18, 2013 · im finding a problem when doing a replace special characters using the replaceAll method. The choice of replaceAll to indicate the regex version makes no sense, and suggests that replace only makes a single substitution, which of course it doesn't. Apr 6, 2014 · I want to replace all 'special characters' with a special character in java For example 'cash&carry' will become 'cash+carry' and also 'cash$carry' will become 'cash+carry' Jan 12, 2014 · How to remove special characters in the string except "- _". *Universit. Dec 22, 2010 · The point is: in literal java strings the backslash is an escape character so the literal string "\" is a single backslash. I know there are heaps of examples there on int May 13, 2015 · I have a String with special characters which I want to be replaced by corresponding reference. , `. Sep 7, 2017 · For instance I have a String that contains: String s = "test string *67* **Hi**"; I want to to get this String : *67* With the stars, so I can start replace that part of the string. replace() is used to replace all occurrences of a specific character or substring in a given String object without using regex. replace() method in Java allows you to replace all occurrences of a specific character or substring with another character or substring. Nov 26, 2010 · You can use basic regular expressions on strings to find all special characters or use pattern and matcher classes to search/modify/delete user defined strings. i have this piece of code: public static String replaceSpecialCharacters(String cadena) { cadena = ca Nov 2, 2025 · Regular expressions (regex) are a powerful tool in Java for pattern matching, validation, and text manipulation. In regex, there are characters that have special meaning. Nov 18, 2016 · I'm trying to replace special characters in a file with a pattern with only special characters, but it doesn't seem to be working. `, `*`, `+`, `?`, `$`) that carry specific meanings—like matching any character (`. In most replacement text flavors, two characters tend to have special Mar 30, 2023 · Use Java String. replaceAll(". . See code examples for string manipulation. , String a = "adf sdf"; How can I replace and avoid special characters? Mar 1, 2021 · There are two overloaded methods available in Java for replace(): String. But I have to convert the string into a string without having any special character so I used Base64 But in Base64 we are using equals to symbol (=) which is a special character. replace () can be used to replace a portion of a supplied string with another string or a regular expression. Jun 20, 2017 · -1 I am trying to replace the substring from a string like: Sample string value '[1]T. replaceAll("\\\\s", ""); I was wondering if there was a command to remove and special character, like a Only one Learn how to efficiently replace multiple characters in a String using Java. Nov 12, 2025 · Understanding how to effectively replace characters in a string is crucial for tasks such as data cleaning, text processing, and formatting. Feb 29, 2024 · The “String. Let’s look at its Jul 23, 2025 · Regular Expressions (regex), in Java, are a tool, for searching, matching, and manipulating text patterns. For example: String sourceCharacters = "šđćčŠĐĆČžŽ"; String targetCharact Jul 27, 2020 · We use the string replace() method to replace a character or substring with another character or substring. Learn about string replacement in Java. I have a string like this: BEGIN\n\n\n\nTHIS IS A STRING\n\nEND And I want to remove all the new line characters and have the result as : BEGIN THIS IS A STRING END How do i accomplish this? The standard API functions will not work because of the escape sequence in my experience. Change "alter table $owner Dec 23, 2024 · String replaceAll method in Java searches for a specified string or regex pattern and returns a new string with the matched characters replaced. Dec 5, 2011 · 4 I have a string which contains special character. Using String. When you need to match these characters *literally* (e. So it shouldn't matter what character it is, it should be replaced with a *. How String. Jul 10, 2025 · The replace() method of String values returns a new string with one, some, or all matches of a pattern replaced by a replacement. Regex patterns are usually written as fixed strings. This is my java code: Jul 31, 2015 · This will make the String look exactly like the String in the Java Code, but it will also show other escape sequences (like \\, \" etc). Apr 16, 2010 · I like to replace a certain set of characters of a string with a corresponding replacement character in an efficent way. Dec 9, 2013 · java regex string replace special-characters edited Dec 9, 2013 at 10:51 anubhava 788k 67 597 665 Jul 10, 2009 · I have string which contains alpahanumeric and special character. replaceAll is a regex you have to escape it with a backslash to treat em as a literal charcter. Jul 16, 2025 · Here, it's important to clean up user input and remove special characters. Is there any java equivalent of the function. Sep 2, 2015 · Java Formatting String to replace Special Character [duplicate] Asked 10 years, 2 months ago Modified 10 years, 2 months ago Viewed 116 times May 15, 2023 · In Java, to remove all special character form a given string, we can use the replaceAll(String regex, String replacement) method of String class. v - Marriage Statement'!C10 with some other string say var1 so that the string becomes Sample string value var1 and this. You can call replace method on the String, where you want to replace characters and it will return a result where characters are replaced. Apr 20, 2025 · Complete Java String. Learn how to use it in this article. replace ("x", "y"); except that the former is strictly slower (replace does not make a new string and returns itself, if you ask it to replace a string that it does not contain. Oct 13, 2014 · I have to replace a string whit special character like this: XY_Universit -WWWWW-ZZZZZ in another one like: XY_Universita-WWWWW-ZZZZZ. "; special = special. This blog will delve into the fundamental concepts, usage methods, common practices, and best practices of replacing characters in a Java string. Jun 19, 2013 · 12 I have a PHP script <?=str_replace(array('(',')','-',' ','. Jan 19, 2012 · How to replace the special character $owner with "hr" and $table_name with "hr" and $constraint_name with "scma_constraint" in dynamic. Indeed, this example is covered in extra \ characters as the character class in the pattern for regexCharacters has to quote many of the special characters. Unfortunately, string is immutable. Aug 26, 2020 · and just fileName = fileName. . : , from an String using Java. However, regex syntax includes special characters (e. v - Marriage Statement'!C10 and this The text to replace is '[1]T. Jun 1, 2024 · In this tutorial, we will learn how to remove special characters from a string in java. `) or quantifying repetitions (`*`). println(myStr. I created the following class to test what's faster, give it a try: Strings - Special Characters Because strings must be written within quotes, Java will misunderstand this string, and generate an error: Learn how to efficiently replace special characters in Java strings using regex and string manipulation techniques. replaceAll () method allows us to search for patterns within a String and replace them with a desired value. Jun 3, 2013 · 1 string = str. replace ? October 13, 2021 - Learn what is replaceAll () method in java string, how it is used to replace multiple occurences of string May 10, 2012 · Which means: find a single character which is neither a letter nor a number nor whitespace. Jan 2, 2018 · I am trying to replace special character }} in a string with "" using regexp in Java, I tired the below two methods and it doesn't work. replaceAll() can replace all occurrences of a specific character or a substring in a String. replace () with CharSequence. This process involves identifying the special characters you want to escape and applying the appropriate escape sequence. replace) We would like to show you a description here but the site won’t allow us. Overview In Java, single quotes are used to define char literals, and double quotes define String literals. Jul 11, 2025 · Output: "geeks" Methods to Replace Character in a String at Specific Index There are certain methods to replace characters in String are mentioned below: Using String Class Using StringBuilder Using StringBuffer 1. Sep 16, 2022 · 1. The Java language provides special support for the string concatenation operator ( + ), and for conversion of other objects to strings. Feb 15, 2012 · Use String#replace() instead of String#replaceAll(), you don't need regex for single-character replacement. Nov 26, 2018 · Replace specific characters in string using regex Asked 7 years, 1 month ago Modified 7 years, 1 month ago Viewed 7k times Well, the String class in Java provides several methods to replace characters, CharSequence, and substring from a String in Java. I need to replace many different sub-string in a string in the most efficient way. Jan 16, 2013 · 25 use [\\W+] or "[^a-zA-Z0-9]" as regex to match any special characters and also use String. String special = "Something @$ great @$ that. A string is often implemented as an array data structure of bytes (or words) that stores a sequence of elements, typically characters, using some character encoding. Replace special characters using replace () method The JavaScript built-in method string. The former will search twice, the latter only once, and either one will make no new strings unless actual string replacing needs to be done. Jun 15, 2024 · In this tutorial, we’re going to be looking at various means we can remove or replace part of a String in Java. Feb 25, 2021 · What happens to the immutable String object when replace() or replaceAll() is used. In this tutorial, we’ll learn how to replace single quotes in Java String. replaceAll (regex, String) to replace the spl charecter with an empty string. replaceAll method tutorial covering all features with examples. Jun 16, 2011 · If no regular expression is required, you can use replace instead of replaceAll which will also replace all occurences but it won't interpret the first argument as a regular expression (see String. 1. replaceAll(regex, "dog")); Try it Yourself » Oct 13, 2014 · I have to replace a string whit special character like this: XY_Universit -WWWWW-ZZZZZ in another one like: XY_Universita-WWWWW-ZZZZZ. replaceAll("\\W", " ") This replace all special character by " " (space). Example 1: Oct 24, 2013 · I want to be able to replace all the letters in a string with an underscore character. This my try: Aug 5, 2011 · If a string is immutable, charAt method, to make change to the string object must receive an argument containing the new character. replaceAll ()” method in Java is used to replace all occurrences of a specific character, word, or substring, with a new character, word, or substring. Aside: in this case the single-character version something. These metacharacters are: \ ^ $ . | ? * + {} [] () If you need to match substring containing these metacharacters, you can either escape these characters using \ or Apr 23, 2024 · To remove special characters from a string in Java, you can use regular expressions with the `replaceAll ()` method to match and replace non-alphanumeric characters with an empty string. Now I use: replaceAll (" [^\\w\\s]", "") it remove all special character but i want to keep "- _" . My code at Closed 5 years ago. Syntax Following is the syntax for replace () May 24, 2016 · I want to replace all the characters in a Java String with * character. Example Get your own Java Server Replace every match of a regular expression with a substring: String myStr = "I love cats. The original string won't alter at all. So for example, lets say that my string is made up of the alpha characters: "Apple". Learn how to effectively replace special characters in a Java string with our expert guide, including code examples and troubleshooting tips. Jan 5, 2015 · I am writing a method which should replace all words which matches with ones from the list with '****' characters. replace('\\','/') would also work. I have t Dec 4, 2012 · In my java code, if a string input has got any of the special characters mentioned, that should get preceded by \\ Special character set is {+, -, &&, ||, !, (, ), {, },[, ], ^, "", ~, *, ?, :, \}. Jul 11, 2025 · Example 1: Replacing All Special Characters with an Underscore This example replaces all special characters with _ (underscore) using the replace () method. Although the String class doesn’t have a remove() method, you can use variations of the replace() method and the substring() method to remove characters from strings. String I want to replace all special characters from the string object BusDetails below with a blank "" except for _ (underscore) and numbers in java ? BusDetails=BusDetails. replace () with Character, and String. How to Escape Special Characters in Java? A String is a sequence of characters. Using String Class There is no predefined method in String Class to replace a specific character in a String, as of now. 7 version : Initially, a String contains alphanumeric & special characters To remove special characters from the given String, use replaceAll () method of String which accepts 2 input-arguments – 1st argument is the regex pattern – allowing only alphanumeric characters [^ a-zA-Z0-9] Jan 8, 2024 · This article explains what Unicode text normalization is, how to remove accents and diacritical marks in text, and the pitfalls to watch out for. In this article, we will learn how to replace a String using a regex pattern in Java. In Java, replacing special characters with their escaped counterparts requires using regular expressions and string manipulation functions. Dec 24, 2025 · The String. Feb 19, 2025 · In this article, you’ll learn a few different ways to remove a character from a String object in Java. But maybe thats exactly what you want Sep 9, 2013 · Replace all special characters Asked 12 years, 3 months ago Modified 11 years, 5 months ago Viewed 1k times We would like to show you a description here but the site won’t allow us. More general, string may also denote a sequence (or list) of data other than just characters. This method is part of the java. Jul 22, 2024 · Learn how to escape special characters in Java Regular Expressions. (we can't use "[\W\S]" as this means find a character which is not a letter or a number OR is not whitespace -- which is essentially all printable character). Example: Input: What is stack overflow? Output: What is stack overflow question mark I used replaceall() to do it, but is Apr 19, 2024 · 1. Apr 8, 2014 · I have a String which contains some special characters and white spaces as well. We can use simple patterns to find and change non-printable Unicode letters as follows: @Test public void givenTextWithNonPrintableChars_whenUsingRegularExpression_thenGetSanitizedText() { Jul 12, 2013 · String replace all special characters in the end Asked 12 years, 6 months ago Modified 12 years, 6 months ago Viewed 7k times Jun 6, 2021 · Method 1: Using String. I want to remove white spaces and special character. Manipulating Characters in a String The String class has a number of methods for examining the contents of strings, finding characters or substrings within a string, changing case, and other tasks. lang. Aug 19, 2012 · Using replaceAll with Strings containing special characters in Java Asked 13 years, 4 months ago Modified 13 years, 4 months ago Viewed 10k times Jun 26, 2025 · Java Program to remove all special characters from String Here is our sample Java program to demonstrate how you can use the replaceAll () method to remove all special characters from a String in Java. But I try to exclude dash "-" as special character. We can also use single quotes in String literals. String. replaceAll () Method The String. replaceFirst for replacing strings containing special regex characters Asked 2 years, 8 months ago Modified 2 years, 8 months ago Viewed 159 times Dec 18, 2024 · The replace () method in Java is an essential tool for string manipulation, allowing developers to replace occurrences of a substring or character within a string with a new substring or character. I need to replace each and every special char with some string. If pattern is a string, only the first occurrence will be replaced. replaceAll ("&#151;", ""). It’s more than a simple search-and-replace tool, as it leverages regular expressions (regex) to identify patterns, making it highly flexible for a variety of use cases. I tried solutions like stringToReplace. Sep 30, 2024 · The String. Aug 5, 2012 · The replace function will replace any (and all) characters it finds, or it will do nothing if that character doesn't exist in the string. I want to replace all special characters in the string shown below: Dec 6, 2014 · 0 I am able replace the special characters in normal java program. txt`), you must "escape Jan 14, 2024 · Java’s String class has strong ways to handle text changes, and regular expressions provide a short way to match and replace patterns in strings.

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