filter out password in xml string
That depends on how confident you are that neither of these cases will be true:


Another tag like  will be introduced that you will want to leave unfiltered
No nested tags will appear within the tag


An example of the last would be:

&lt;UserPassword&gt;&lt;for name="boy"&gt;Sue&lt;/for&gt;&lt;/UserPassword&gt;


It seems your assumptions are safe, but if you want to be certain, go with

self.request.gsub! /\&lt;UserPassword\&gt;.+?\&lt;/UserPassword\&gt;/gm, '&lt;UserPassword&gt;[FILTERED]&lt;/UserPassword&gt;'


By eliminating the greediness of the regex, you can match the exact tag you mean and reduce the assumptions that will come back and bite you.