Mastering Negative Lookahead: How to Match “Sitemap” URLs—Except One
Regex can be a tricky beast—powerful, yet unforgiving. One wrong move and your carefully crafted pattern either misses matches or catches too much, leading to website functionality headaches. Today’s case study? A website suffering from overmatching syndrome. The goal: to match any URL containing “sitemap”, except for one specific case—/sitemap_index.xml. This is where negative lookahead … Read more