Regex is not searching string

Question

I am searching this string package com.

This is the code

Pattern l_pattern = Pattern.compile("package com\\.",Pattern.CASE_INSENSITIVE);
String l_entireFile=readEntireFile(p_filePath.toString());
String l_spiltCommentString []  =   l_pattern.split(l_entireFile);

But it is not searching the same in all the file.

I just want to know why it is showing this behavior.

it was not searching the contents because we have tab and double spaces in the package name.!!!Thanks — Java_Alert
– Java_Alert, Commented Aug 6, 2013 at 9:51

fge · Accepted Answer · 2013-08-06 08:07:41Z

3

Just use .indexOf():

l_entireFile.indexOf("package com.") != -1

Also, if this is really a Java source file, there is no need for Pattern.CASE_INSENSITIVE: both keywords and package names are case sensitive in Java.

answered Aug 6, 2013 at 8:07

fge

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3 Comments

Alan Moore Over a year ago

indexOf() won't work because we don't know which/how many whitespace characters to expect, so you would have to use Matcher.find() instead. But split() is definitely the wrong tool for this job.

fge Over a year ago

@AlanMoore "[...]we don't know which/how many whitespace characters to expect," <-- sorry, but I see no relationship at all between whitespaeces and the text to search; unless you mean that there can be an arbitrary number of spaces between package and .com?

Alan Moore Over a year ago

Yes, that's what I meant. And according to the OP's comment, that was indeed the problem.

Alan Moore · Accepted Answer · 2013-08-08 13:58:12Z

2

Escape backslashes.

Pattern l_pattern = Pattern.compile("package com\\\\.",Pattern.CASE_INSENSITIVE);

UPDATE

You don't need to use regular expression.

String l_spiltCommentString []  = l_entireFile.split("package com.");

Package name contains spaces

Use following pattern.

Pattern l_pattern = Pattern.compile("package\\s+com\\.",Pattern.CASE_INSENSITIVE);

edited Aug 8, 2013 at 13:58

Alan Moore

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answered Aug 6, 2013 at 8:03

falsetru

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2 Comments

Java_Alert Over a year ago

I am putting \\ to escape '.'.

Java_Alert Over a year ago

Thanks actually it was not searching the contents because we have tab and double spaces in the package name.

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