Java replaceAll regex read from XML

Question

So I have read 2 strings from an xml file. The xml string is:

<regex code="bla[. ]?(.*)\n" replacement="cpe_ip_learning_table:\\n$1\\n "/>

This reads into two separate variables for a replaceAll call. i.e:

str = str.replaceAll(code, replacement);

However, even when I try a \n as a replacement instead of a \\n it still does not insert a newline.

I am using a DOM DocumentBuilder to read the XML file into two separate strings. I have tried using Matcher.quoteReplacement as well to no avail. Has anyone run into this issue and how have they solved it?

l'L'l · Accepted Answer · 2014-09-10 05:55:51Z

1

I've experienced this same behavior also, and the only way I found to fix it was by doing a replaceAll on the replacement string itself:

rep = replacement.replaceAll("\\\\n", "\n")
str = str.replaceAll(code, rep);

Strings returned by DOMDocument ignore newline (\n) constructs for some strange reason.

answered Sep 10, 2014 at 5:55

l'L'l

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2 Comments

bge0 Over a year ago

I'm curious why they do this though. Could it be because we use doc.normalize() ?

l'L'l Over a year ago

@bge0, doc.normalize doesn't appear to be the reason, for the behavior remains the same whether used or not. It's almost as if the replaceAll pattern expects literal newlines to be in the replacement string, which could only be represented by including a physical carriage return in the places you've got the construct \n (see here); that definitely doesn't seem right either.

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