Java - PatternSyntaxException


Java - PatternSyntaxException
Java - PatternSyntaxException

PatternSyntaxException is a Runtime Java Exception that you may get while dealing with Regular Expressions in your program that is incorrect. Please make sure that your expression is valid.

Example:
public static void main(String[] args) {

	String dataString = "This.is.my.string.";
	String[] dataStringArr = dataString.split("${\\.}");
	for (String data : dataStringArr) {
		System.out.println(data);

	}
}
Output Error Stack Trace:
Exception in thread "main" java.util.regex.PatternSyntaxException: Illegal repetition near index 1
\${\.}
 ^
	at java.base/java.util.regex.Pattern.error(Pattern.java:2027)
	at java.base/java.util.regex.Pattern.closure(Pattern.java:3320)
	at java.base/java.util.regex.Pattern.sequence(Pattern.java:2213)
	at java.base/java.util.regex.Pattern.expr(Pattern.java:2068)
	at java.base/java.util.regex.Pattern.compile(Pattern.java:1782)
	at java.base/java.util.regex.Pattern.(Pattern.java:1428)
	at java.base/java.util.regex.Pattern.compile(Pattern.java:1068)
	at java.base/java.lang.String.split(String.java:2317)
	at java.base/java.lang.String.split(String.java:2364)
	at com.code2care.java.tutorials.Sample.main(Sample.java:8)

The correct expression syntax here should be "\\." making sure to escape the dot with slashes.




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