User input from HTML form fields is generally provided to JavaScript as a string. We’ve lived with that fact for decades but sometimes developers need to extract numbers from that string. There are multiple ways to get those numbers but let’s rely on regular expressions to extract those numbers!
To employ a regular expression to get a number within a string, we can use \d+
:
const string = "x12345david"; const [match] = string.match(/(\d+)/); match; // 12345
Regular expressions are capable of really powerful operations within JavaScript; this practice is one of the easier operations. Converting the number using a Number()
wrapper will give you the number as a Number
type.
Designing for Simplicity
Before we get started, it’s worth me spending a brief moment introducing myself to you. My name is Mark (or @integralist if Twitter happens to be your communication tool of choice) and I currently work for BBC News in London England as a principal engineer/tech…
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