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Hi there! And thanks for Processwire! It appears that i've found something interesting about PW selectors. They should only be strings! Here's an example of SQL-like syntax for selector: $my_complex_selector = " name='some name', parameter=123, other_parameter=[subparam>=subvalue] "; Trying to use this selector lead to a very buggy PW behaviour. It appears that newlines are treated in a very special manner by PW selector engine, preventing the newlined selectors from working as expected. I cannot imagine a situation when an unescaped newline could be a part of selector or selector value, so stripping newline symbols from selector could be a good idea for further PW development. And, currently, another good idea is to write complex selectors as PHP arrays: $my_complex_selector = [ "name=$name", "param1=$param1", ]; and to implode them into a single line before using find() and other functions which use selectors. Sorry if i wrote something trivial, but having this post already present at support forum could save me a couple of hours. Hope mine will save that tame for someone else ?