If you master regular expressions (regex), you can do most of the things without tools. Regex is a technology that allows text search under various conditions.
By the way, this tool also uses regex in the program. For example, “Delete blank lines” is a delete the character that matches the regex
^\s*?$(\r\n|\r|\n)?. This symbol is called a metacharacter and has an abstract meaning. Regex is searching by combining these metacharacters.
||Beginning of line|
||0 to n whitespace|
||End of line|
||0 to 1 line feed|
I also wrote an article on regex, so please have a look if you like.