notepad++ how to match lines match lines containing specific characters or empty lines

The following is the tutorial column of notepad to introduce notepad matching lines to match lines containing specific characters or blank lines. I hope it will be helpful to friends in need!

For example, there are the following characters in a line:

12q34m56

Use the following regular expression to match

^(.*)34(.*)$

Use the following regular rules to match blank lines, one of which must be available. If it is invalid, you can restart notepad

^(\s*)\r\n
^(\s*)\n
^(\s*)\r\n

Remove multi-line comments

/\*(.|[\r\n])*?\*/

does not match Lines containing hehe characters

^((?!hehe).)*$

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