How to use REGEX in tJava(row,flex)

[Anonymous]

I have hit a wall using tExtractRegexFields, namely positive lookahead, which does not appear to be in this list, so it appears I cannot use that component. Let's start simple. How would I use a simple regex to match something from a column in a tFileInputDelimited and cat it to a tLogRow?

[cterenzi]

tExtractRegexFields should support any regex supported by Java's Pattern class.

[Anonymous]

If I use 

(?<=myvalue:)[0-9]*

on data

blah () ; blah, {} words myvalue:42 more data [] 23

in jEdit or elsewhere, it matches "42". Talend is not giving me a match. 

regex_match.PNG

[Anonymous]

Also, if I attempt to match data inside brackets in Talend I am met with an "Invalid escape sequence.." error. This works elsewhere. Please see screenshots.

[Anonymous]

If it is known why these are not working any help would be appreciated. As per the OP, if it is known how to use REGEX in a tJavawhatever component, that information would be greatly appreciated.

[Anonymous]

bump

[crt1]

It works fine with Pattern and Matcher within a tJavaRow component.

I used tRowGenerator to generate one row with your string:

blah () ; blah, {} words myvalue:42 more data [] 23

In the tJavaRow, aside from the input and output row code I used the following code as a very rough example:

Pattern pattern = Pattern.compile("(?<=myvalue:)[0-9]*");
Matcher matcher;

if (pattern.matcher(input_row.Test).find()){
	System.out.println("Row Matched");
}
else{
	System.out.println("Row not Matched");
}

Which gave me the following result when I ran the job:

 

Hope this helps..!