Based on different scenarios we may need to create a regex pattern based on a given string. replaceAll(). 2. Learn how to replace multiple words in a string in Java just like PHP's str_replace function. Follow our expert guide with code snippets and best practices. "); precio_gold = Say you have the following string: cat dog fish dog fish cat You want to replace all cats with dogs, all dogs with fish, and all fish with cats. Intuitively, the expected result: dog fish cat fis 35 I need to replace a dynamic substring withing a larger string, but only once (i. out. Mar 11, 2024 · IN - Java | Written & Updated By - Anjali In this article we will show you the solution of java replace multiple characters in string, Java is a powerful programming language with several functionalities for manipulating strings. Cats are very easy to love. Discover methods with clear examples. replace("dogs", "budgies"); System. StringBuilder is mutable, that is, it can be changed as much as you want. The pattern can be a string or a RegExp, and the replacement can be a string or a function to be called for each match. Nov 7, 2025 · String manipulation is a cornerstone of Java programming, and two methods that often cause confusion are `replace()` and `replaceAll()`. Jul 22, 2025 · The replaceAll() method of String values returns a new string with all matches of a pattern replaced by a replacement. Java has several methods to effectively replace numerous characters within a string, which is a common operation. Is it possible to replace multiple strings with multiple other strings at the same time in JavaScript, so that the correct result will be produced? Learn how to replace multiple words in a single string using Java with examples and best practices for string manipulation. 1. lang. Learn how to efficiently replace multiple substrings in a Java string with a single pass using regular expressions and the replaceAll method. Nov 6, 2017 · Now in this code I want to replace <userName> with alpha, <firstName> with beta, <lastName> with gama at once without making multiple string objects. In this article, we will learn how to replace a String using a regex pattern in Java. So, the method could be used to replace every s with a d in a string, or every “ pop ” with “ pup ”. The original string is left unchanged. It is a powerful string manipulation tool in Java. The first parameter is a regular expression pattern to match. Feb 2, 2024 · This article explains replaceAll, replace, and replaceFirst methods that can be used to replace multiple characters in a string. . prototype. replace to replace multiple search strings simultaneously. For example all 'r' in the sentence would become Feb 22, 2017 · Replace the string values where Refer is common with Resident Referral and replace the string values where Return is common with Return Visitor. Instead, you can use regular expressions or the `StringBuilder` class for more efficient performance, particularly when dealing with large texts or many replacements. Jun 6, 2021 · Method 1: Using String. In Java, you can replace parts of a string using the `String. We would like to show you a description here but the site won’t allow us. I have two concerns with using regex: Sep 2, 2024 · Java String replace() method replaces every occurrence of a given character with a new character and returns a new string. Every time you do a replace on a String, a new String object is created, because Strings are immutable. 160 If you want to replace multiple characters you can call the String. Oct 27, 2011 · I try to replace multiple occurrences of a character with a single character. " However, this does not produce "I have a dog, a goat, and a cat", but instead it produces "I have a cat, a cat, and a cat". Get a Character From the Given String Apr 20, 2025 · Complete Java Matcher. I don't know if java will optimize such an in a row replace methods to be done in just one traverse? Oct 5, 2013 · Without replaceall Output: [3, 2, 1] With replaceall Output: 3,2,1 Is there anyway to do this using single replaceAll method, something like set. replaceAll () method allows us to search for patterns within a String and replace them with a desired value. Jul 27, 2020 · The Java string replace () method is used to replace all instances of a particular character or set of characters in a string with a replacement string. Here is my current inefficient (and kinda silly IMO) fu Nov 20, 2013 · . " We cannot predict the value of the "123" part and the "def" part. Dec 27, 2023 · In this comprehensive Java string replacement guide, we‘ll explore how to efficiently replace single and multiple characters in strings using the tools available in Java and on Linux systems. Dec 22, 2025 · In this blog, we’ll explore efficient, scalable methods to replace multiple substrings, diving into algorithms, data structures, and libraries that outperform brute force. At first glance, they seem to serve the same purpose—substituting parts of a string—but their behavior differs significantly under the hood. Jun 23, 2023 · Discover easy techniques to replace multiple strings in JavaScript! Breakdown of methods, code snippets, and clear explanations for beginners and pros alike. Sep 25, 2025 · You'll learn to manipulate, analyze and modify strings, the fundamental building blocks of text data, with the help of multiple Java String programs. The task is to replace multiple strings with new strings simultaneously instead of doing it one by one, using JavaScript. All you need is an object representing the character mapping that you will use in that function. Sep 30, 2024 · The String. For instance, "John and Robert were on the way to meet Elizabeth" should return "Joe and Bob were on the way to meet Liz". This function is used to replace certain substrings in a string with respective values. replace ()` method. Is there any way to this more efficiently without generating multiple Strings using the normal String class? Learn how to efficiently replace a string only once in Java without using regular expressions. For example: I have a String with multiple placeholder, each has string placeholder name. Example 2: Invalid regex when passed in raplaceAll () method, raises Apr 4, 2015 · Instead of using String. Return Value: This method returns the resulting String. replace('á','a'); str. The code looks like this: noHTMLString = noHTMLString. replaceAll ()” method in Java is used to replace all occurrences of a specific character, word, or substring, with a new character, word, or substring. Using replace () Method with Regular Expression The replace () method with a regular expression is a simple and efficient way to replace multiple characters. Dec 20, 2022 · I have string such as String url = "www. for example: String precio_gold = "59,99$"; precio_gold = precio_gold. replaceAll method tutorial with examples. replace, make an array/list of words, iterate the words and replace the element in the list if needed and join them. com/blabla/?p1=v1?p2=v2?p3=v3" I would like to replace the "substrings" "v1","v2" and "v3" with other 88 Am I missing something, or does StringBuilder lack the same "replace all occurrences of a string A with string B" function that the normal String class does? The StringBuilder replace function isn't quite the same. Aug 20, 2013 · I have the following string: String str = "Klaße, STRAßE, FUß"; Using of combined regex I want to replace German ß letter to ss or SS respectively. May 31, 2012 · What's the difference between java. We’ll cover edge cases, pitfalls, and help you choose the right approach for your use case. Sep 16, 2022 · The difference between replace () and replaceAll () method is that the replace() method replaces all the occurrences of old char with new char while replaceAll() method replaces all the occurrences of old string with the new string. Jun 19, 2013 · 12 I have a PHP script <?=str_replace(array('(',')','-',' ','. Jul 11, 2025 · In this article, we are given a Sentence having multiple strings. Step-by-step guide with code examples. Regex patterns are usually written as fixed strings. We’ll compare their performance, discuss trade-offs, and provide actionable best practices to boost your application’s speed. println(myStr. String 's replace() and replaceAll() methods, other than the latter uses regex? For simple substitutions like, replace . I scan the lines of the text and then each word in the text Well, the String class in Java provides several methods to replace characters, CharSequence, and substring from a String in Java. test. join(" ", elements); The Java replace () string method allows the replacement of a sequence of replace multiple strings at once js regex, how to use multiple replace function in String: How to replace multiple possible characters with a single character? Apr 3, 2012 · I know that this may be an amateur question but for some reason I can't remember how to do this. com Learn how to efficiently replace multiple characters in a Java string with a single character using regular expressions. This process can become particularly tricky when the strings involved are long or numerous. replace in Java with practical examples, best practices, and common pitfalls in this detailed tutorial. Feb 16, 2024 · Exception NullPointerException- replace () method returns this exception when the target char/CharSequence is null. Let’s look at its Jun 13, 2018 · 3 I want to replace three String s that are present in multiple files. @elchininet's implementation holds truer to PHP's str_replace(), because it also allows strings as find/replace parameters, and will use the first find array match if there are duplicates (my version will use the last). Input: hhiii!!! hooowww aaareee yyyooou??? Output: hi! how are you? public class CharSingleOccurrence { p Jul 9, 2015 · I have a string with this format abc-123-def and I want to replace the first "-" with "_" and the second "-" with ". Jan 11, 2014 · I'm currently building a config file that will replace a given string with multiple variables, I'm having a hard time explaining it so perhaps it would be best to show you what I mean: The following Learn how to effectively use Java's `replaceAll()` method to search and replace multiple strings in one go. test string can have more angular elements in it to be filled with dynamic values. replace () with Character, and String. Right now I'm focused on replacing all letters in the first sentence of the array with different characters. Mar 1, 2021 · I have an array of 6 different strings. This is my current code I just want to add more conditions in the convert method Apr 20, 2025 · The String. They use replace, replaceFirst and replaceAll. Jul 4, 2019 · This implementation avoids excessive string copies / complex regexes and thus should perform really well compared to an implementation that uses either replace or replaceAll. Pseudo code Jun 19, 2018 · Next you have to move your next strings' to replace ids by the difference between the (previous string's that you replaced length) and (the string that you put in its place). replace () with CharSequence. '), "", $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. You need to assign the result of the call back to your variable. This method allows you to avoid multiple iterations over the string, thereby improving performance, especially for large texts. Each of them Mar 22, 2015 · It won't be. Java String replace () Examples The following examples demonstrate how to use the replace () method in Java: Example 1: Java String replace (char old, char new) Method To show the working of replace (char old, char new). What is the The string is "I have a cat, a dog, and a goat. You can call replace method on the String, where you want to replace characters and it will return a result where characters are replaced. I created the following class to test what's faster, give it a try: Feb 3, 2024 · Java FAQ: How can I use multiple regular expression patterns with the replaceAll method in the Java String class? Here’s a little example that shows how to replace many regular expression (regex) patterns with one replacement string in Scala and Java. replace Method If you have a limited number of substrings to replace and performance is not a critical concern, you can use multiple calls to String. String s ="["; String q ="]"; if my text contains any of these i want to replace it Aug 5, 2011 · I want to replace some chars with accents in a String like this example: str. I'm using this code but it is replacing word but giving result in two different lines. replaceAll(regex, "dog")); Try it Yourself » Dec 6, 2021 · Using replace() function in JavaScript has many use cases such as removing unwanted or escape characters in a string. In Java, replacing multiple strings within a single input string can be efficiently accomplished using regular expressions (regex). | TheDeveloperBlog. replace () method This method returns a new string resulting from replacing all occurrences of old characters in the string with new characters. replace ()` repeatedly. Say I want to replace "EVENT" with "MYEVENT", "TRACE" with "TRACE" and "LOGS" with "MYLOGS". replace: Jul 23, 2025 · Here are the various methods to replace multiple characters in a string in JavaScript. In java 8: String. format and provide format string like %-XXs where XX is the length of the non-transposed chord with spaces. I have a problem with the replaceAll for a multiline string: String regex = "\\\\s*/\\\\*. replace() method is a flexible tool in Java and is commonly used for a wide range of practical applications, from cleaning up user input to modifying strings for specific business rules. replaceAll () Method The String. with /, is there any difference? Learn how to use String. In fact it will be orders of magnitude faster than multiple calls to replace, because the replace calls also have to iterate over the string one character at a time behind the scenes. Jan 6, 2016 · A utility method StringUtils. Jun 4, 2024 · In Java, efficiently replacing multiple different substrings in a string can be a common requirement, especially when dealing with templates or user input where variables need to be inserted. "; String regex = "(?i)cat"; System. 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. Cats are very popular. This method allows you to replace substrings with new values, and can be called consecutively to handle multiple replacements in a single line of code. Introduction to String Replacement in Java Before we look at the specifics of replacing characters, let‘s briefly go over the key methods at our disposal: May 19, 2016 · Here are 2 functions defined that do the exactly same thing: take input a template (in which one wants to replace some substrings) and array of strings values (key value pair to replace, such as [ Apr 11, 2013 · String handling in Java is something I'm trying to learn to do well. Basically replace () works with replacing chars and replaceAll () works with replacing part of strings. I have written three functions for it but I want to combine these functions into a single function. See code examples for string manipulation. May 1, 2017 · Is it optimal using two replace function in a row! Because each replace method will traverse the String while we can do the replacement in just one traverse. Using String. String testString = "Hello {USERNAME}! 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;. StringBuilder with Index Tracking. **`replace()`** is designed for **literal substitutions**: it replaces exact characters or substrings Apr 11, 2016 · I can use this: String str = "TextX Xto modifyX"; str = str. Learn how to efficiently replace multiple characters in a String using Java. first match). One of my functions is: Nov 27, 2010 · I have to write some sort of parser that get a String and replace certain sets of character with others. 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. e. Don't use String#replaceAll in this case if there is slight chance part you will replace your string contains substring that you will want to replace later, like "distance" contains a and if you will want to replace a later with "velocity" you will end up with "disvelocityance". replace("cats", "dogs") . // map (string_to_replace, string_to_replace_with) String template = "ola ala kala pala sala"; StringBuilder Jul 23, 2025 · Regular Expressions (regex), in Java, are a tool, for searching, matching, and manipulating text patterns. Discover the quickest techniques for performing multiple string replacements in Java, including best practices and code examples. replace() with the replacement argument being a function that gets called for each match. I'm writing a program that will replace multiple words in a single string. Is there any java equivalent of the function. const s1 = "hello world!"; Jan 12, 2017 · I wonder if there is a way to use replace() with multiple replacement in one line in java. I want multiple words replaced and String s = "I have three cats and two dogs. Oct 13, 2021 · October 13, 2021 - Learn what is replaceAll() method in java string, how it is used to replace multiple occurences of string using regex and string replacement. Then use that group number for getting the replacement lambda. replaceAll Dec 23, 2024 · public String replaceAll (String regex, String replace_str) Parameters: regex: the regular expression to which this string is to be matched. Learn how to replace text using regular expressions in Java. replace(",", ". Jun 5, 2012 · I want to replace first occurrence of String in the following. replace('â','a'); str. The second parameter is the replacement string. replace("z", "Zulu "); However, this obviously doesn't work since after it replaces every "a" with "Alpha," it'll take every "l" "p" and "h" and reconvert those and so on. Also, education and languages apps benefit from this feature when auto-correcting multiple words in a paragraph. I have 2 strings. Below are a few methods to understand: Example Get your own Java Server Replace every match of a regular expression with a substring: String myStr = "I love cats. The method returns a new string with all replacements made. Jan 11, 2014 · I have the following program that I would like to replace all occurrences of a string where a word exists as a key in a map with its corresponding value. String. Apr 25, 2014 · I want my program to replace every vowel in the inputted string. I have implemented 4 methods. Strings are immutable in Java - the replaceAll method doesn't modify the string - it creates a new one. 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. This is not a homework question. replaceAll("&lt;/p&gt;", "\\n"); Apr 11, 2017 · What function can replace a string with another string? Example #1: What will replace "HelloBrother" with "Brother"? Example #2: What will replace "JAVAISBEST" with "BEST"? Nov 26, 2024 · Java String Replace, replaceAll and replaceFirst methods. 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. Indeed, it is impossible to do replacements of individual characters in a String without stepping through each character position. How can I get this done? Mar 1, 2021 · There are two overloaded methods available in Java for replace(): String. Feb 29, 2024 · The “String. toString(). "; s = s. *\\\\*/"; String testWorks = " /** this should be replaced **/ just text Hi so I'm trying to convert multiple characters in one string just wondering how I can add more. Currently I want to take in a string and replace any characters I find. println(s); This is intended to replace cats => dogs and dogs => budgies, but the sequential replacement operates on the result of the previous replacement, so the unfortunate output is: I have three budgies and two budgies. public static void main (String [] args) { // TODO code application logic here char vowel; vowel = 'a'+'e'+' Dec 9, 2015 · 1 Look at Replace multiple substrings at Once and modify it. Feb 15, 2012 · Use String#replace() instead of String#replaceAll(), you don't need regex for single-character replacement. In Java, replacing multiple substrings can be optimized beyond the naive approach of calling `String. String test = "see Comments, this is for some test, help us" **If test contains the input as follows it should not replace Aug 17, 2015 · To ensure that replacement has the same length I use String. I'm looking for a review of any and all aspects, but especially: Jun 20, 2021 · 0 I am new to Java and am trying to make a program that will take a string 'names' and replace the names of the people mentioned in that string with a nickname from another string 'replacement'. 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. replace('ã','a'); This will work, but I want to know if there is some simpl What is the fastest way in java to replace multiple placeholders. replace('X','');//that does not work because there is no such character '' Is there a way to remove all occurrences of character X from a Dec 14, 2015 · Also, you haven't mentioned this in your question, but if you're hoping to replace multiple instances in the same string, for example, if your input were I will find cookies, will you?, and you wanted to replace both instances of will, you could use X. The String class provides only replace(), which replaces ALL instances of the substring; there is a replaceFirst() method but it only takes regexp instead of a regular string. You can specify the part of the String you want to replace and the replacement String in the arguments. replace_str: the string which would replace found expression. group numbers as Integer keys Lambdas as values Modify the loop to check which group was matched. Feb 19, 2025 · Learn how to replace characters and substrings in Java using replace(), replaceAll(), and replaceFirst(). Nov 30, 2025 · In this blog, we’ll explore **optimized methods** to perform multiple string replacements efficiently in Java. This comprehensive guide offers clear examples an Dec 24, 2025 · The String. replaceAll method replaces each substring of a string that matches a given regular expression with a replacement. To perform this I have: String replaceUml = str Jan 30, 2018 · How to replace multiple occurences of a character in a java string using replace and charAt methods Asked 7 years, 1 month ago Modified 7 years, 1 month ago Viewed 64 times These Java examples replace strings, chars and CharSequences. Use a Map<Integer, Function<Matcher, String>>.

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