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javascriptjqueryuppercasecapitalization

Javascript Uppercase first x characters if matching specific words?

I'm trying to work out in javascript / jquery how to capitalise the first 3 characters of a string, if that string starts with one of several matches.

In php I can do:

$loc = (preg_match("/^(nww|nsw|esw|sew|wes)/i", $loc)) ? strtoupper( substr( $loc, 0, 3 ) ).substr( $loc, 3 ) : ucfirst($loc);

Which would change nsw48751 to NSW48751, but change newlease to Newlease.

How can I do this in javascript or jquery ?

Thanks

Solution

  • One option is to alternate between matching any of those 3 letters, and if none of those are found, match the first letter in the string. Then, use a replacer function to capitalize the match:

    const change = str => str.replace(/^(?:nww|nsw|esw|sew|wes|[a-z])/i, match => match.toUpperCase());
console.log(change('nsw48751'));
console.log(change('newlease'));