The start() method of Matcher Class is used to get the start index of the match result already done.
public int start()
Parameters: This method do not takes any parameter.
Return Value: This method returns the index of the first character matched.0
Exception: This method throws IllegalStateException if no match has yet been attempted, or if the previous match operation failed.
Below examples illustrate the Matcher.start() method:
Current Matcher: java.util.regex.Matcher[pattern=(G*k) region=0,5 lastmatch=]
Current Matcher: java.util.regex.Matcher[pattern=(G*G) region=0,3 lastmatch=]
Reference: Oracle Doc
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