how do i match a number with a letter directly after or before-CodePudding

const input = "2a smith road ";

const input 2 = "333 flathead lake road, apartment 3b"

const address = input.replace(/(^\w{1})|(\s \w{1})/g, letter => letter.toUpperCase());

Output should look like this:

input = "2A Smith Road"

input = "333 Flathead Lake Road, Apartment 3B"

CodePudding user response：

I think looking for a word character (\w), preceded ((?<=...)) by a word boundary (\b) and optional digits (\d*) should cover all cases:

const input = [
  "2a smith road",
  "333 flathead lake road, apartment 3b"
];

const capitalize = (s) => s.replace(/(?<=\b\d*)(\w)/g, l => l.toUpperCase());

input.forEach(s => console.log(capitalize(s)))

CodePudding user response：

You can match 1 or more digits followed by a lower case char \b\d [a-z]\b and uppercase the whole match

[
  "2a smith road",
  "333 flathead lake road, apartment 3b"
].forEach(s => console.log(s.replace(/\b\d [a-z]\b/g, m => m.toUpperCase())));