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Editorial Team
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Asked: 2026-05-16T18:23:15+00:00

I’ve got this java function that extracts strings from Inputstreams and returns a List.

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I’ve got this java function that extracts strings from Inputstreams and returns a List. It uses java.util.Scanner and java.util.regex.Pattern.

Problem is, it only seems to work the first time I call it. If I reverse my calls, again only the first one works, the second call never returns any matches.

List lsphones = extract(is,pattern,0);
List lsemails = extract(is,pattern”,0);

I suspect I need to reset the Lists or something in the funciton -if not the function itself somehow. I’ve tried but keep getting exceptions when I do.

public static List<String> extract(InputStream in,String matchpattern,int grp) {

..
scanner.close();
return what

I’m developing this in the Android SDK.

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1 Answer

  1. Editorial Team

    Does your extract method read until the end of the stream? I suspect you need to close and reopen the stream to start again from the beginning. If this is the case, a better approach would be to do all your matching on one pass through the stream.

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