See the internal implementation code as described below. This method is implemented in simple way to understand. (Pattern.java:1427)Īt java.base/.compile(Pattern.java:1068)Īt java.base/(String.java:2135)Īt .(StringReplaceAllExample.java:21)īecause, We have imputed a invalid regex. We'll simulate the program to throw this exception.Įxception in thread "main" 圎xception: Unclosed character class near index 3Īt java.base/.error(Pattern.java:2015)Īt java.base/.clazz(Pattern.java:2683)Īt java.base/.sequence(Pattern.java:2126)Īt java.base/.expr(Pattern.java:2056)Īt java.base/.compile(Pattern.java:1778)Īt java.base/. I f we don't pass a valid one then will get PatternSynta圎xception. This method expects to get a valid regular expression. There is a case where it throws run-time exception using replaceAll method. replaceAll () takes two parameters regex and replacement strings and returns a new string with all the characters in the original string that match with. The replaceAll in java is present inside the String class. String replaceAll() throws PatternSynta圎xception The replaceAll in java is a method used to replace all the occurrences of a particular character in a string with other characters. This code will find all blank spaces and replaces with - symbol.Īfter removing white spaces : Welcome-to-java-w3schools-blogģ. ("After removing white spaces : " + replacedNewString2) String replacedNewString2 = str2.replaceAll("\\s", "-") String str2 = "Welcome to java w3schools blog" Our program need to remove all white spaces using regular expression and replace with hyphen (-) symbol. Furthermore, the Java String replaceFirst() method is used to replace the first occurring character with a new character. Now, will give input a sentence which has spaces in it. Java String replaceAll() method works in accordance with the regular expression and based on the regular expression, we are free to choose what type of operation we are going to have on an input String. An invocation of this method of the form. Java 8 is present twice in the input string but after invoking replaceAll method, it is replaced all to Java 12.Ģ.2 Replacing white spaces with hyphen(-) Replaces each substring of this string that matches the given regular expression with the given replacement.
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