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From: Jim Janney <jjanney@shell.xmission.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: Parse a text file and match more than one line
Date: Mon, 02 Apr 2012 20:57:45 -0600
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Jim Janney <jjanney@shell.xmission.com> writes:

> mike <mikaelpetterson@hotmail.com> writes:
>
>> Hi,
>>
>> I am trying to figure out how to use regexp in java to match this
>> pattern:
>>
>>
>> compile:
>>     [javac] Compiling 933 source files to /tmp/gdduser/classes
>>
>> dft.properties:
>>
>> So I want to make sure I have:
>>
>> compile:
>>     [javac] Compiling 933 source files to /tmp/gdduser/classes
>> <<nothing on this line>>
>>
>> How can I use java to apply it? It will be something like, when
>> "compile:" is found check that there is a [javac] Compiling .... on
>> next line . If there is then I need to check if there is an empty
>> line. If all conditions are fullfilled then I can I know that my build
>> step is completed and I have a full match.
>>
>> Any ideas?
>>
>> br,
>>
>> //mike
>
> If the file is not too large, you can read it all into a single string
> and apply a regexp to that.

Or...

A matcher needs a CharSequence, not a string, and you can build a
CharSequence from a ByteBuffer, and you can map a ByteBuffer directly to
a file.  Put it all together and you get something like this:

http://www.java2s.com/Code/Java/File-Input-Output/ApplyingRegularExpressionsontheContentsofaFile.htm


I'd guess this could be horribly expensive for some kinds of patterns.

-- 
Jim Janney