Regular Expression for matching parentheses

Question

What is the regular expression for matching     in a string   Following is the scenario     I have a string   str    abc efg      I want to split the string at     using regular expression For that i am using   Arrays asList Pattern compile       split str     But i am getting the following exception   java util regex PatternSyntaxException  Unclosed group near index 2      Escaping     doesn t seems to work

User · Answer

The solution consists in a regex pattern matching open and closing parenthesis

String str = "Your(String)";
// parameter inside split method is the pattern that matches opened and closed parenthesis, 
// that means all characters inside "[ ]" escaping parenthesis with "\\" -> "[\\(\\)]"
String[] parts = str.split("[\\(\\)]");
for (String part : parts) {
   // I print first "Your", in the second round trip "String"
   System.out.println(part);
}

Writing in Java 8's style, this can be solved in this way:

Arrays.asList("Your(String)".split("[\\(\\)]"))
    .forEach(System.out::println);

I hope it is clear.

User · Answer

You can escape any meta-character by using a backslash  so you can match   with the pattern       Many languages come with a build-in escaping function  for example   Net s Regex Escape or Java s Pattern quote Some flavors support  Q and  E  with literal text between them  Some flavors  VIM  for example  match   literally  and require    for capturing groups    See also  Regular Expression Basic Syntax Reference

User · Answer

Because   is special in regex  you should escape it    when matching  However  depending on what language you are using  you can easily match   with string methods like index   or other methods that enable you to find at what position the   is in  Sometimes  there s no need to use regex

User · Answer

For any special characters you should use      So  for matching parentheses  -

User · Answer

Two options   Firstly  you can escape it using a backslash --     Alternatively  since it s a single character  you can put it in a character class  where it doesn t need to be escaped --

[java] Regular Expression for matching parentheses

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