java.util.regex.PatternSyntaxException: Illegal repetition near index 3 (?<={NP}.*.(?={/NP}) ^

Coderanch | deepika deepi | 5 years ago
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    java error for extraction

    Coderanch | 5 years ago | deepika deepi
    java.util.regex.PatternSyntaxException: Illegal repetition near index 3 (?<={NP}.*.(?={/NP}) ^
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    Coderanch | 5 years ago | deepika deepi
    java.util.regex.PatternSyntaxException: Illegal repetition near index 3 (?<={NP}.*.(?={/NP}) ^
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Root Cause Analysis

  1. java.util.regex.PatternSyntaxException

    Illegal repetition near index 3 (?<={NP}.*.(?={/NP}) ^

    at java.util.regex.Pattern.error()
  2. Java RT
    Pattern.compile
    1. java.util.regex.Pattern.error(Pattern.java:1730)
    2. java.util.regex.Pattern.closure(Pattern.java:2792)
    3. java.util.regex.Pattern.sequence(Pattern.java:1906)
    4. java.util.regex.Pattern.expr(Pattern.java:1769)
    5. java.util.regex.Pattern.group0(Pattern.java:2500)
    6. java.util.regex.Pattern.sequence(Pattern.java:1823)
    7. java.util.regex.Pattern.expr(Pattern.java:1769)
    8. java.util.regex.Pattern.compile(Pattern.java:1477)
    9. java.util.regex.Pattern.<init>(Pattern.java:1150)
    10. java.util.regex.Pattern.compile(Pattern.java:840)
    10 frames
  3. Unknown
    Words.main
    1. Words.main(Words.java:12)
    1 frame