/usr/ is in libregexp-java 1.5-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/doc/
/usr/share/doc/libregexp-java/
/usr/share/doc/libregexp-java/copyright
/usr/share/doc/libregexp-java/README
/usr/share/doc/libregexp-java/changelog.Debian.gz
/usr/share/maven-repo/
/usr/share/maven-repo/jakarta-regexp/
/usr/share/maven-repo/jakarta-regexp/jakarta-regexp/
/usr/share/maven-repo/jakarta-regexp/jakarta-regexp/debian/
/usr/share/maven-repo/jakarta-regexp/jakarta-regexp/debian/jakarta-regexp-debian.pom
/usr/share/maven-repo/jakarta-regexp/jakarta-regexp/1.5/
/usr/share/maven-repo/jakarta-regexp/jakarta-regexp/1.5/jakarta-regexp-1.5.pom
/usr/share/java/
/usr/share/java/regexp-1.5.jar
/usr/share/maven-repo/jakarta-regexp/jakarta-regexp/debian/jakarta-regexp-debian.jar
/usr/share/maven-repo/jakarta-regexp/jakarta-regexp/1.5/jakarta-regexp-1.5.jar
/usr/share/java/regexp.jar