perldoc.perl.org - Perl documentation
Java API - Java SE 8 API
PHP manual - PHP manual
Sync between IMAP servers
https://imapsync.lamiral.info/INSTALL.d/INSTALL.Ubuntu.txt
sudo apt-get install -y imapsync imapsync \ --host1 imap.SRV1.com --user1 user1@example.com --password1 *** \ --host2 imap.SRV2.de --user2 user2@example2.com --password2 *** \ --noauthmd5
create patch
diff -Naur FILE_ORG FILE_EDITED > FILE.diff
Gedit add regexp search and replace
http://www.kiwwito.com/article/regex-in-search-and-replace-for-gedit
Regexp test
https://www.regextester.com/15
Online Markdown editor
https://dillinger.io/
https://www.tablesgenerator.com/