{"id":1116,"date":"2024-12-03T18:38:20","date_gmt":"2024-12-03T16:38:20","guid":{"rendered":"https:\/\/www.juustila.com\/antti\/?p=1116"},"modified":"2024-12-03T18:43:11","modified_gmt":"2024-12-03T16:43:11","slug":"advent-of-code-day-3-revisited","status":"publish","type":"post","link":"https:\/\/www.juustila.com\/antti\/2024\/12\/03\/advent-of-code-day-3-revisited\/","title":{"rendered":"Advent of Code Day 3 revisited"},"content":{"rendered":"\n

So, originally I did this the old school style, parsing the input string character by character, managing the state of processing while discovering the elements from the input string.<\/p>\n\n\n\n

Tonight I reimplemented part 1 using #Swift<\/a> RegexBuilder. I\u2019ve never been comfortable in using regular expressions (regex) but wanted to give a try. <\/p>\n\n\n

\n
\"Swift
Snippet of RegexBuilder code showing how to specify what elements to pick from the input string.<\/figcaption><\/figure>\n<\/div>\n\n\n

Got it working nicely after some hiccups, as usual – wondered why the sum of mul operations was smaller than expected, and it was because I had Repeat(1...2)<\/code> instead of Repeat(1...3)<\/code> in the code. Didn’t notice that some mul<\/code> parameters were three numbers, since in puzzle examples there were only two numbers. So the regex was only picking first two numbers at most from the input :facepalm: <\/p>\n\n\n\n

Learned something new. Maybe regexes are not so terrifying things after all…<\/p>\n\n\n

\n
\"An<\/figure>\n<\/div>","protected":false},"excerpt":{"rendered":"

So, originally I did this the old school style, parsing the input string character by character, managing the state of processing while discovering the elements from the input string. Tonight I reimplemented part 1 using #Swift RegexBuilder. I\u2019ve never been comfortable in using regular expressions (regex) but wanted to give a try. Got it working … Continue reading “Advent of Code Day 3 revisited”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[2],"tags":[136,149,70,150,46],"class_list":["post-1116","post","type-post","status-publish","format-standard","hentry","category-coding","tag-advent-of-code","tag-aoc2024","tag-programming","tag-regex","tag-swift"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.juustila.com\/antti\/wp-json\/wp\/v2\/posts\/1116","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.juustila.com\/antti\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.juustila.com\/antti\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.juustila.com\/antti\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.juustila.com\/antti\/wp-json\/wp\/v2\/comments?post=1116"}],"version-history":[{"count":2,"href":"https:\/\/www.juustila.com\/antti\/wp-json\/wp\/v2\/posts\/1116\/revisions"}],"predecessor-version":[{"id":1121,"href":"https:\/\/www.juustila.com\/antti\/wp-json\/wp\/v2\/posts\/1116\/revisions\/1121"}],"wp:attachment":[{"href":"https:\/\/www.juustila.com\/antti\/wp-json\/wp\/v2\/media?parent=1116"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.juustila.com\/antti\/wp-json\/wp\/v2\/categories?post=1116"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.juustila.com\/antti\/wp-json\/wp\/v2\/tags?post=1116"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}