Java Examples Java Videos Java Compiler Java Exercises Java Quiz Java Code Challenges Java Practice Problems Java Server Java Syllabus Java Study Plan Java Interview Q&A ... String myStr = "I love cats. Cats are very easy to love. Cats are very popular."; String regex = "(?i)cat"; System.out.println(myStr.replaceAll(regex, "dog"));

July 29, 2026 - As we can see, the replaceAll() method replaces every character in input with “:“. This is because “.” has a special meaning in regex: matching any character. Next, let’s see how to tell the regex engine to treat special characters as literal.

August 22, 2024 - Learn how to use Java's replaceAll() method with regular expressions for complex string manipulations like formatting input, sanitizing data, and more.

December 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.

Beginning Java · joe nesbitt · Greenhorn · Posts: 17 · posted 15 years ago · Number of slices to send: Optional 'thank-you' note: Send · Hi all, i have a regex that checks if the content between the 5th and 6th occurence of | is "" as follows: (TEST\\|[||]*\\|\\|[||]*\\|[||]*\\|)\"\"") It works fine with string.replaceall().

JAVA-P1001 · Major · Performance · String.replaceAll() is a method that accepts a regex string, and replaces all occurrences of the regex with the provided replacement string. If you are only trying to replace a specific substring and not ...

An invocation of this method of the form str.replaceAll(regex,repl) yields exactly the same result as the expression · <blockquote> {@link java.util.regex.Pattern}.{@link java.util.regex.Pattern#compile compile}(<i>regex</i>).{@link java.util.regex.Pattern#matcher(java.lang.CharSequence) matcher}(<i>str</i>).{@link java.util.regex.Matcher#replaceAll replaceAll}(<i>repl</i>) </blockquote> Note that backslashes (\) and dollar signs ($) in the replacement string may cause the results to be different than if it were being treated as a literal replacement string; see java.util.regex.Matcher#replaceAll Matcher.replaceAll.

May 8, 2009 - This works: String oldStr = "XYZ*"; String newStr = oldStr.replaceAll("\\*", "[A-Za-z0-9]*"); System.out.println("newStr=" + newStr + "\n"); ... Welcome to JavaRanch You need to use \\ instead of \. The reason is that the String literal turns the \\ into a single \ before it analyses the regular ...

September 8, 2020 - public String replaceAll(String regex, String replacement) { return Pattern.compile(regex).matcher(this) .replaceAll(replacement); }

Replaces every subsequence of the input sequence that matches the pattern with the result of applying the given replacer function to the match result of this matcher corresponding to that subsequence.

April 16, 2022 - public String replaceAll(String regex, String replacement) { return Pattern.compile(regex).matcher(this).replaceAll(replacement); } class A { public void replace(){ String init = "Bob is a Bird... Bob is a Plane... Bob is Superman!"; String changed = init.replaceAll("/[@]/g,", "_"); } } class A { private static final java.util.regex.Pattern p = Pattern.compile("/[@]/g,"); // compile it only once and reuse it public void replace(){ String init = "Bob is a Bird...

August 3, 2023 - The Java String class replaceAll() method is used to replace each substring that matches the regex of the string with the specified text, another string passed as a parameter.

July 21, 2026 - Parameters: regex - the regular ... · public String replaceAll(String regex, String replacement) Replaces each substring of this string that matches the given regular expression with the given replacement....

class Example { static void main(String[] args) { String str1 = "!!Tutorials!!Point", str2; String substr = "**", regex = "!!"; // prints string1 println("String = " + str1); /* replaces each substring of this string that matches the given regular expression with the given replacement */ str2 = str1.replaceAll(regex, substr); println("After Replacing = " + str2); } } When we run the above program, we will get the following result − ·

April 18, 2026 - Object output = regexReplace(input, "/\\d+/", "#"); // Apply String.replaceAll(regex, repl) to the input value. System.out.println(output); // Print transformed output. Sample Input · abc123def456 · Sample Output · abc#def# Run the Java Regex Replace tool online with live input and output.

September 24, 2015 - PatternSyntaxException if the specified regular expression(regex) is not valid. String replaceAll(String regex, String replacement): It replaces all the substrings that fits the given regular expression with the replacement String.

June 15, 2024 - As their name implies, replaceAll() will replace every matched occurrence, while the replaceFirst() will replace the first matched occurrence: String master2 = "Welcome to Baeldung, Hello World Baeldung"; String regexTarget = "(Baeldung)$"; ...

May 23, 2016 - Java replaceAll replaces each substring that matches the regular expression with a new string. Let's show to write String.replaceAll in Java.

assert abstract boolean break byte case catch char class continue default do double else enum exports extends final finally float for if implements import instanceof int interface long module native new package private protected public return requires short static super switch synchronized this throw throws transient try var void volatile while Java String Methods · charAt() codePointAt() codePointBefore() codePointCount() compareTo() compareToIgnoreCase() concat() contains() contentEquals() copyValueOf() endsWith() equals() equalsIgnoreCase() format() getBytes() getChars() hashCode() indexOf() isEmpty() join() lastIndexOf() length() matches() offsetByCodePoints() regionMatches() replace() replaceAll() replaceFirst() split() startsWith() subSequence() substring() toCharArray() toLowerCase() toString() toUpperCase() trim() valueOf() Java Math Methods