lookahead « Operation « Java Regex Q&A

1. Java RegEx with lookahead failing    stackoverflow.com

In Java, I was unable to get a regex to behave the way I wanted, and wrote this little JUnit test to demonstrate the problem:

public void testLookahead() throws Exception {
  ...

2. Java RegEx: Split without losing token    stackoverflow.com

I'm trying to write regex that will split a string when there is whitespace followed by a negative sign followed by non whitespace. Example:

"x -y".split(regex)
returns: String[]{"x","-y"};

(?<=\\s)-(?=\\S+)

3. Java regular expression with lookahead    stackoverflow.com

is there a way to print out lookahead portion of a regex pattern in java?

    String test = "hello world this is example";
    Pattern p ...

4. Why isn't this lookahead assertion working in Java?    stackoverflow.com

I come from a Perl background and am used to doing something like the following to match leading digits in a string and perform an in-place increment by one:

my $string = ...

5. Regex lookahead question    coderanch.com

This is basically a general regex question tho I'm using the Java-flavor of it. I'm parsing a file containing variables wich are denoted by $name. I need to find all the variables for later use. However one syntax gives me a problem: $varName in $varList Here I only wish to match $varList. I've tried to use a negative lookahead like so: ...

6. help w/ negated lookahead regex    forums.oracle.com

p7e wrote: I'm building a servlet to handle multipart binary form data. The target begins with a bunch of dashes immediately followed by a sequence of digits. Then there's junk with CRLF which is not and end target to start the data. But eventually there is a CRLFCRLF which does signal the start of data. This scares the hell out of ...