Heck, grep even has a command-line options to control which implementation of regex it uses. The sad state of regular expressions is that expressions are not entirely portable between different implementations of regex searchers. It should be noted that this is strictly unique to Notepad++. I’ve cracked the code of how to do it in Notepad++. Regular expressions can find things easily, but I’m also told by witches that it can store the things it finds for later use, and that this is a powerful tool at their disposal.

I needed to identify lines that matched “date: ” and then change it to “updated: ”. It came up when I wanted to do a mass-rename of a front-matter attribute in my blog posts. I recently have figured out how to perform one new nifty trick with Notepad++ and regular expressions: replacing text with a regular expression match.

I don’t claim mastery - I just know enough to be alternately useless and useful. Set_bad_domains.update(filter(regexp.Anyone who claims mastery over regular expressions is a witch. Tested on Raspberry Pi 3b (for lower performance test): # Method 1 - time taken: 0:00:06.572112 Is the extra time taken in methods 1 and 3 more likely due to the extra manipulation of set_bad_domains (add or update) or using more individual regex searches? If this is the best option then I may need to see if it's possible to split the set_regexps into groups of ~5-10 to keep the OR statements to a minimum. Method 2 seems to be the fastest, although I am really not keen on it as if the regexps grow to, say, over 100, the regexp is going to be ridiculous. What's the best way to go here? Below are my current experiments. Query set_hosts and add matches to set_bad_domainsĬreate a new set, excluding domains in set_bad_domains I've found a couple of different methods, however I am not keen on the fastest method as it could potentially be crippled by OR statements if the regexp list grows significantly. The grep syntax I have been using with bash scripts is grep -vf and I've been trying to replicate this in Python. I have been playing around with Python for ~24 hours now and have hit a stumbling block with regards to invert matching regexps against a list.

Notepad++ regex invert match