Java String Replace Multiple Placeholders. The replaceAll () method can be further used with regular expression

The replaceAll () method can be further used with regular expressions to match more dynamic patterns, such as multiple identical placeholders or variable spacing. Generating formatted strings with placeholders in Java can be easily achieved using various libraries, such as Apache Commons Lang or StringTemplate. '), "", $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. 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. Here's utility class that is capable of filling strings with placeholders and extract values of placeholders from filled strings. 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. I created the following class to test what's faster, give it a try: 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. Say I want to replace "EVENT" with "MYEVENT", "TRACE" with "TRACE" and "LOGS" with "MYLOGS". I am wondering what the best approach is to replace a String placeholder with an Oct 6, 2021 · Replace one placeholder for another placeholder in Java String Asked 3 years, 5 months ago Modified 3 years, 5 months ago Viewed 224 times I want to be able to replace those string of text without reading in the file, writing it to another file, and deleting the original file. replace (. These libraries simplify the process of replacing placeholders with actual values, making your code cleaner and more maintainable. I wanted to substitute the placeholder dynamically in properties in a java application. Return Value: This method returns the resulting String. reduce () and replaceAll (). In this process how can I replace the placeholders with the actual property values? Dec 9, 2015 · 1 Look at Replace multiple substrings at Once and modify it. group numbers as Integer keys Lambdas as values Modify the loop to check which group was matched. I have used the code below for single placeholder replacement, Jan 15, 2015 · I have a requirement to create a generic method that takes an input String like "Hello Mr. In Java, the `String. is there another way other then the brute force way of replacing each field using string. For example all 'r' in the sentence would become Explains how to use placeholders in strings. replace () with Character, and String. Feb 15, 2012 · Use String#replace() instead of String#replaceAll(), you don't need regex for single-character replacement. Split and join string: splitting the string into an array, merging it with the I also have String variables for name, invoice number and due date - what's the best way to replace the tokens in the template with the variables? (Note that if a variable happens to contain a token it should NOT be replaced). Use a Map data structure to define key-value pairs for replacements, allowing for dynamic and flexible replacements. Here is my current inefficient (and kinda silly IMO) fu 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. May 15, 2025 · Explain Code This code dynamically replaces the placeholder tokens [name] and [order_id] with specific values, making it a useful method for creating personalized content from templates. This component bridges the gap between raw text generated by LLMs and structured code that can be evaluated. replaceAll () method allows us to search for patterns within a String and replace them with a desired value. Feb 22, 2016 · I'm in an intro cse class using Java and I have a new homework where I create a Mad Lib game using File Processing. The original string is left unchanged. String s = "I have three cats and two dogs. 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. Like WelcomeMessage=Welcome Mr. String testString = "Hello {USERNAME}! Nov 30, 2025 · In this blog, we’ll explore **optimized methods** to perform multiple string replacements efficiently in Java. format for dynamic string manipulation. Dec 18, 2022 · December 18, 2022 - Learn what is String. what is the best way to do this. Based on different scenarios we may need to create a regex pattern based on a given string. format() method to format a template-based string, such as String. Learn the fastest methods to replace multiple string placeholders in Java with detailed examples and best practices for string manipulation. Mar 1, 2021 · I have an array of 6 different strings. Is there a more efficient way of doing find and replace texts in a file using Java? How to do string formatting with placeholders in Java (like in Python)? Asked 12 years, 6 months ago Modified 4 years ago Viewed 87k times 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. Learn more on Scaler Topics. May 2, 2012 · 2 I have strings which look something like this: "You may use the promotion until [ Start Date + 30]". We would like to show you a description here but the site won’t allow us. replaceAll () Method The String. 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". 160 If you want to replace multiple characters you can call the String. I need to replace the [ Start Date + 30] placeholder with an actual date - which is the start date of the sale plus 30 days (or any other number). Also, education and languages apps benefit from this feature when auto-correcting multiple words in a paragraph. I want multiple words replaced and Feb 22, 2015 · 17 Here's a more generic approach that doesn't require you to provide a pattern, works for multiple placeholders and can match a placeholder over multiple words too. Say, we have the following template and input string: Jun 19, 2013 · 12 I have a PHP script <?=str_replace(array('(',')','-',' ','. One of my functions is:. 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. [Start Date] may also appear on its own without an added number. " and replace the tokens with the same named fields in a provided Java bean. replace() with the replacement argument being a function that gets called for each match. 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. Java has several methods to effectively replace numerous characters within a string, which is a common operation. Because if you change the string, then you'd change the parameters at the same time. Currently I want to take in a string and replace any characters I find. This algorithm offers no cache strategy. Is there any java equivalent of the function. We might easily apply the same replacement to multiple tokens in a string with the replaceAll method in both Matcher and String. Find variable reference (placeholder), replace it with its variable value. The substring begins at the specified index start and extends to the character at index end - 1 or to the end of the sequence if no such character exists. replace ()` repeatedly. If that's really a concern, perhaps you need to modify an array of chars (but that will be a non-trivial task when substituting multiple strings of varying lengths differing from their placeholders). For example: String one: "<username> <password>" String t Dec 6, 2021 · Using replace() function in JavaScript has many use cases such as removing unwanted or escape characters in a string. format() in java and how to use it to replace placeholders in a string with variables at runtime with examples. P, your name is Mr. Sep 25, 2017 · I am working with a code where I want fill several string place holders with another strings. replace_str: the string which would replace found expression. "; s = s. Neither can I do some String insert based on the position since the values in the DB can always change. Each In Java, replacing multiple substrings can be optimized beyond the naive approach of calling `String. replace ? Feb 18, 2010 · In Python, when formatting string, I can fill placeholders by name rather than by position, like that: print "There's an incorrect value '%(value)s' in column # %(column)d" % \\ { 'value': x, 'co Jul 26, 2019 · I have a template string str = "Hello %s, your name is %s, %s 's born in 1990. Dec 23, 2024 · public String replaceAll (String regex, String replace_str) Parameters: regex: the regular expression to which this string is to be matched. out. format(“%s is awesome”, “Java”). Jul 22, 2025 · The replaceAll() method of String values returns a new string with all matches of a pattern replaced by a replacement. Basically replace () works with replacing chars and replaceAll () works with replacing part of strings. In this article, we will learn how to replace a String using a regex pattern in Java. May 23, 2022 · Then you'd replace the new placeholder with a new value! This might lead to unexpected behavior, which is why I suggested using this solution instead; replace all matches at once, preventing this from happening. See code examples for string manipulation. lang. This lets you store the string in one place in one format and then at a later time replace the corresponding items using only one function. To replace the customer placeholder, I could use the We would like to show you a description here but the site won’t allow us. These allow us to determine if some or all of a string matches a pattern. Use a Map<Integer, Function<Matcher, String>>. Sep 2, 2024 · Java String replace() method replaces every occurrence of a given character with a new character and returns a new string. Mar 8, 2020 · 1. replace () method This method returns a new string resulting from replacing all occurrences of old characters in the string with new characters. How can I get this done? 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. Feb 8, 2011 · Can i have placeholder for String java like we have in sql prepared statements? Eg Conside that i have string St = "akkk ? la,ala ? " , now i want to set values of ? as i set it in sql prepared Apr 25, 2014 · I want my program to replace every vowel in the inputted string. This process can become particularly tricky when the strings involved are long or numerous. replace() method in Java allows you to replace all occurrences of a specific character or substring with another character or substring. Learn how to implement it today!---Th Discover the quickest techniques for performing multiple string replacements in Java, including best practices and code examples. replace () is the inbuilt method which is used to replace the characters in a substring of this sequence with the characters in the specified String. replace("dogs", "budgies"); System. Placeholders are enclosed in % characters or curly braces. 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. String myStr = "Media file %s of size %s has been 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. format ()` method allows you to create formatted strings using a format string and arguments. 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. Learn how to efficiently replace placeholders in a Java string using MessageFormat and String. ) . Jul 22, 2019 · Java String replace() method examples to replace a character, replace a substring in a string, String replace() method with StringBuffer and StringBuilder. 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. Then use that group number for getting the replacement lambda. May 8, 2013 · In a given String like this "/uploads/$ {customer}/$ {dateTime ('yyyyMMdd')}/report. Is there a feature in any Java libraries or third party ones where you can have placeholders in the String value and they get replaced by variables. If you want one sentence to remember: write SQL once, bind values safely, and let PreparedStatement do what it was built to do. The pattern can be a string or a RegExp, and the replacement can be a string or a function called for each match. May 30, 2024 · String formatting is a fundamental aspect of programming, enabling developers to create dynamic and readable strings. Overview When we need to find or replace values in a string in Java, we usually use regular expressions. P, Mr. replace () with CharSequence. In Java, one interesting way to perform string formatting is through the use of named placeholders, akin to Python's f-strings or format method. Is there any way to this more efficiently without generating multiple Strings using the normal String class? Java String replace() method allows you to replace all occurrences of a character or substring with a new character or substring in a string. In this tutorial, we’ll explore how to make string formatting support named parameters. 2 days ago · Replace string concatenation with placeholders, bind values with the right types, and wrap everything in try-with-resources. At first glance, they seem to serve the same purpose—substituting parts of a string—but their behavior differs significantly under the hood. These Java examples replace strings, chars and CharSequences. Nov 7, 2025 · String manipulation is a cornerstone of Java programming, and two methods that often cause confusion are `replace()` and `replaceAll()`. Named placeholders improve the readability of these format strings. Looking at what alternatives there might be, you still need something to identify pairs of strings. Example: In this example we replaces multiple characters in a string with '?' using Array. I'm writing a program that will replace multiple words in a single string. 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. ---more. public static void main (String [] args) { // TODO code application logic here char vowel; vowel = 'a'+'e'+' Jun 13, 2018 · 3 I want to replace three String s that are present in multiple files. Unless you get the string as input from somewhere, but then I'd take a good look at how you want to design your program. com Jun 18, 2009 · The fact that the replace method returns a string object rather than replacing the contents of a given string is a little obtuse (but understandable when you know that strings are immutable in Java Nov 18, 2017 · I am writing a sample java file to read this property file and create a map object with some filtered properties. They use replace, replaceFirst and replaceAll. Simply: Learn how to efficiently replace multiple substrings in a Java string with a single pass using regular expressions and the replaceAll method. {firstName} {lastName}. " I want to format this string, as below: Hello Mr. You’ll feel the difference in performance and peace of mind. prototype. Regex patterns are usually written as fixed strings. I can do the following how to replace two String s in the same format() ? example String. 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. Java standard library provides the String. This guide provides clear steps for implementing placeholder replacement Sep 22, 2017 · Good to keep close by, this simplified guide to String formatting in Java covers numbers, the available flags, and handling multiple arguments. Step-by-step guide with code examples and common mistakes. Jul 11, 2025 · It uses regular expressions to globally replace occurrences of each old string with its corresponding new string. Pseudo code Apr 18, 2023 · The replace (int start, int end, String str) method of StringBuilder class is used to replace the characters in a substring of this sequence with characters in the specified String. " 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". Example 2: Invalid regex when passed in raplaceAll () method, raises Feb 19, 2025 · Learn how to replace characters and substrings in Java using replace(), replaceAll(), and replaceFirst(). Replace placeholders and build dynamic templates in Java and Spring. Utilize Java's regex capabilities to match and replace multiple strings in one pass. A non-regex implementation can be found in StringUtils. xml for runtime values in Android applications. I'm using this code but it is replacing word but giving result in two different lines. Feb 2, 2024 · This article explains replaceAll, replace, and replaceFirst methods that can be used to replace multiple characters in a string. String. P 's born in 1990. What is the fastest way in java to replace multiple placeholders. Jul 23, 2025 · Regular Expressions (regex), in Java, are a tool, for searching, matching, and manipulating text patterns. This is the example text I have used to test my code. Apr 11, 2013 · String handling in Java is something I'm trying to learn to do well. All you need is an object representing the character mapping that you will use in that function. Let’s look at its 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. format("%s %s!", ["hello", "world"]); is this possible? Learn how to replace placeholders like ' {Name}' in Java using String methods and regular expressions for effective string manipulation. Dec 13, 2021 · The StringBuffer. 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? 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"? Jun 20, 2021 · 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'. I need to replace many different sub-string in a string in the most efficient way. Aug 9, 2018 · I got 2 strings. Learn how to replace specific characters in strings with dynamic values using Java. Dec 19, 2022 · Java String Interpolation is the process of replacing the placeholders in a string in Java with variable values. Right now I'm focused on replacing all letters in the first sentence of the array with different characters. I have a string with 2 placeholders, that I want to replace on runtime based on value calculations. It is simple to use, and you can replace multiple placeholders in a single call. The string is "I have a cat, a dog, and a goat. {firstName} {lastName} !!! These firstName and LastName variable needs to be Learn how to dynamically replace placeholders in a Java string with corresponding values from another string efficiently and effectively!---This video is bas Nov 6, 2017 · Note that strings are immutable, and as such you can't easily do this without creating new string objects. I have written three functions for it but I want to combine these functions into a single function. replace("cats", "dogs") . One contains the "format" and placeholders, while the other contains the actual value for the placeholders. Mar 1, 2021 · There are two overloaded methods available in Java for replace(): String. Sep 30, 2024 · The String. This method is part of the java. 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). For May 23, 2015 · This tutorial explains how to replace strings in streams, arrays and files, and comes with full code. | TheDeveloperBlog. Dec 24, 2025 · The String. String There are two main types of variable-expanding algorithms for variable interpolation: [3] Replace and expand placeholders: creating a new string from the original one, by find–replace operations. If pattern is a string, only the first occurrence will be replaced. For example: I have a String with multiple placeholder, each has string placeholder name. --- Java is a powerful programming language Jan 7, 2026 · It uses static analysis to identify method boundaries, handles string encoding issues, and processes test results from multiple datasets. This guide covers simple string replacements, MessageFormat, regex, StringSubstitutor, and Spring’s property placeholder resolution with detailed code examples. Feb 16, 2024 · Exception NullPointerException- replace () method returns this exception when the target char/CharSequence is null. Learn how to dynamically replace placeholders in a string with values in Java. pdf" I need to replace a customer and a yyyyMMdd timestamp. Discover a simple way to replace placeholders in strings using `BeanUtils` with this straightforward guide and example. Interview Questions Related to Java String Formatting What are named placeholders and how do they differ from traditional string formatting methods? Can you give an example of using named placeholders in a Java application? What are the advantages of using named placeholders for string formatting? How Placeholder4j can help you Placeholder4j is a library that helps you to replace placeholders in a string. That is to my knowledge not possible to do with es6 template literals. Instead, you can use regular expressions or the `StringBuilder` class for more efficient performance, particularly when dealing with large texts or many replacements. **`replace()`** is designed for **literal substitutions**: it replaces exact characters or substrings Apr 11, 2025 · A quick example and explanation of the replace() API of the standard String class in Java. Jun 6, 2021 · Method 1: Using String. We’ll compare their performance, discuss trade-offs, and provide actionable best practices to boost your application’s speed. .

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