When testing the string "page-42440233_45778105" against the pattern "(page-\d+_\d+)", an online tester at was able to successfully find a match. However, when executing the code in browser js, the result is null. Why might this be?
var re = new RegExp("(page-\d+_\d+)", "gim");
var r_array = message.match(re);
console.log(r_array);
In my opinion, a more effective pattern to use would be:
const regex = /^page-\d+_\d+$/i;
This regular expression also checks for the beginning (^) and end ($) of the string.
let result = message.match(regex);
//=> ["page-42440233_45778105"]
When working with string literals, it is important to escape the backslash character \.
var message = "page-42440233_45778105";
var re = new RegExp("(page-\\d+_\\d+)", "gim");
var r_array = message.match(re);
console.log(r_array);
// => ["page-42440233_45778105"]
An alternative approach is to use a regular expression literal:
var re = /(page-\d+_\d+)/gim;
Using a string literal requires escaping the \ character like this:
var pattern = new RegExp("(item-\\d+_\\d+)", "gim");
Instead of using the RegExp constructor, consider using a regex literal for a cleaner solution:
var pattern = /(item-\d+_\d+)/gim
If the regular expression is not changing, it's better to stick with regex literals instead of the constructor.
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