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Re: Check if String.matches() AND (if yes) extract number from String?

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On 11/21/11 7:04 AM, Jochen Brenzlinger wrote:
> Assume I have a String var and value like:
>
> String var = new String("foobar[345]");
>
> Now I want to check if this string matches a certain pattern and if yes extract the number into a long var.
> The first part is easy:
>
> if var.matches("\\w*\[\\d+\]") {
>     long l = ????;  }
>
> ....but I have no idea on how to extract the number.
> How can this be achieved?

I believe that if you want detailed information about the actual 
matches, you need to use either the Scanner or Matcher class, rather 
than the limited regex functionality of the String class.
http://download.oracle.com/javase/6/docs/api/java/util/Scanner.html
http://download.oracle.com/javase/6/docs/api/java/util/regex/Matcher.html

I'm more accustomed to .NET regex handling, but either of those classes 
appear to provide the same match-group identification features you are 
looking for and which are available in .NET's Regex class.

Pete

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Check if String.matches() AND (if yes) extract number from String? jochen2@brenz.com (Jochen Brenzlinger) - 2011-11-21 15:04 +0000
  Re: Check if String.matches() AND (if yes) extract number from String? Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2011-11-21 07:33 -0800
  Re: Check if String.matches() AND (if yes) extract number from String? Tassilo Horn <tassilo@member.fsf.org> - 2011-11-21 16:45 +0100
  Re: Check if String.matches() AND (if yes) extract number from String? Henk van Voorthuijsen <voorth@xs4all.nl> - 2011-11-21 07:39 -0800
  Re: Check if String.matches() AND (if yes) extract number from String? Roedy Green <see_website@mindprod.com.invalid> - 2011-11-21 10:26 -0800
  Re: Check if String.matches() AND (if yes) extract number from String? Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2011-11-21 11:43 -0800

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