Stronger regex; see #664

[btry]

Please see the above mentioned issue.

This change works for me and is still working with sample_23

EDIT : this may / should also be applied to replaceBlock()

[juch]

I use this one :

'/'. // start of block '(<w:p(?:(?!<w:p)[\s\S])*\$\{'.$blockname.'\}<\/w:.*?p>)'. // content of block '(.*?)'. // end of block '(<w:p(?:(?!<w:p)[\s\S])*\$\{\/'.$blockname.'\}<\/w:.*?p>)'. // end of the string '.*'. '/ism'

[troosan]

this issue does not seem to apply anymore, wrote unit test for it TemplateProcessorTest::testCloneBlock
Feel free to reopen/create new PR if needed