The answers highlight the importance of separating pattern and matching classes (which is probably what the question asks), but nobody answers why can't we just use a constructor new Pattern(regex) instead of a static compile function. marcolopes comment is on spot.

Feb 13, 2013 · I have read the documentation and various tutorials online but I'm still confused on how regex works in Java. What I am trying to do is create a function which takes in argument of type string. I...

Feb 12, 2015 · Pardon my presumption in correcting your code, but you were using the escapes inconsistently. I find it's best to display the regex as a Java string literal, just as it would appear in the source code. It makes it easier to explain that it's the Java compiler that requires the double escapes, not the regex compiler.

May 17, 2017 · Thread-safety with regular expressions in Java SUMMARY: The Java regular expression API has been designed to allow a single compiled pattern to be shared across multiple match operations. You can safely call Pattern.matcher () on the same pattern from different threads and safely use the matchers concurrently. Pattern.matcher () is safe to construct …

Apr 5, 2015 · I tried looking for a solution to this error but still can't use the class java.util.regex.Pattern, So I tried to make the import manually but I can only see three classes Matcher, MatchResult and PatternSyntaxException.

Jan 9, 2012 · Your import is defined wrong. You'll either need to provide explicit imports of each class, as so: import java.util.regex.Matcher; import java.util.regex.Pattern; Or do import java.util.regex.*; You're trying to import a package, you need the * meta-character for that. If you read the message the compiler gives you, it says it can't find Class regex.

Oct 2, 2008 · I use RegexBuddy while working with regular expressions. From its library I copied the regular expression to match URLs. I tested successfully within RegexBuddy. However, when I copied it as Java S...

String#split accepts a regex. If you don't want to escape the special char +, you can use Pattern#quote: Returns a literal pattern String for the specified String.

The java.util.regex is bundled with the standard Java runtime. (Which means that you don't need to include a separate .jar file to access it.) To answer your question: It's in the rt.jar file.

Mar 18, 2010 · I have been using the java.util.regex.* classes for Regular Expression in Java and all good so far. But today I have a different requirement. For example consider the pattern to be "aabb". Now if the