lookahead

Wyciąga treść z nagłówków h2.

this should cover all USA cities with special characters as per https://en.wikipedia.org/wiki/List_of_U.S._cities_with_diacritics

This regex takes a function declaration and transforms it to an arrow function. Replace: const $1 = $2 => $3;

Extracting temperature measurements from txt file

Same temperature measurement extraction example but this time using grouping such that we can choose only the positive measurements before September 10