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From: Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: Regexp exception in String.replaceAll
Date: Wed, 26 Sep 2012 16:30:42 +0200
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On 26/09/2012 14:57, Tim Slattery allegedly wrote:
> I'm getting an "IndexOutOfBoundsException" from the regex processor
> when I call String.replaceAll.
> 
> Here's the call:
> 
> String result = upload.replaceAll("\\{FileName\\}", fileName);
> 
> "upload" is a string that contains at least one occurrence of
> "{FileName}", which is to be replaced by the actual filename passed
> into this method. Unfortunately, I don't know what the filename was
> when the exception occurred. The stacktrace looks like this:
> 
> java.lang.IndexOutOfBoundsException: No group 5
>         at java.util.regex.Matcher.group(Matcher.java:470)
>         at java.util.regex.Matcher.appendReplacement(Matcher.java:737)
>         at java.util.regex.Matcher.replaceAll(Matcher.java:813)
>         at java.lang.String.replaceAll(String.java:2189)
>         at (the line shown above)
> 
> I'm aware that replaceAll uses the regexp mechanism for matching
> strings. But I can't imagine what could cause this exception. Does
> anybody have a clue?
> 

Read the Javadoc carefully:

<http://docs.oracle.com/javase/7/docs/api/java/lang/String.html#replaceAll%28java.lang.String,%20java.lang.String%29>
> Note that backslashes (\) and dollar signs ($) in the replacement string may cause the results to be different than if it were being treated as a literal replacement string; see Matcher.replaceAll. Use Matcher.quoteReplacement(java.lang.String) to suppress the special meaning of these characters, if desired. 

-- 
DF.