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.<init>(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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Author Info:
Rakesh (He/Him) has over 14+ years of experience in Web and Application development. He is the author of insightful How-To articles for Code2care.
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