The filter is here https://github.com/geotools/geotools/blob/main/modules/library/main/src/main/java/org/geotools/filter/LikeFilterImpl.java
The eventual conversion to a java pattern is here https://github.com/geotools/geotools/blob/main/modules/library/main/src/main/java/org/geotools/filter/LikeToRegexConverter.java and there is a method to recognize and fix special characters - and newline is not on the list. Looking a little more at java Pattern ( https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html) matcher used: - The newline character is special to the java pattern matcher, so support would need to be added to LikeToRegexConverter - The pattern matcher has a flag for MULTILINE which is not used So you are not missing anything, support for multiline is not implemented / available. As a workaround I suggest doing a string substitution using <https://docs.geotools.org/stable/userguide/library/main/function_list.html#strreplace-string-search-replace-all-returns-string> function call on your adr_label and pass the result to PropertyIsLike Jody
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