String to Title Case in Javascript
~ 5 min read. Published 01 Apr 2015Based on the title case project. Which I discovered through this jekyll fix titlecase an npm package while switching to jekyll (in fact there are numerous npm packages that wrap this same library)
The author of the npm package adds 3 more exceptions to the original source code
function toTitleCase(str) {
var smallWords = /^(a|an|and|as|at|but|by|en|for|if|in|nor|of|on|or|per|the|to|vs?\.?|via)$/i;
return (str + '').replace(/[A-Za-z0-9\u00C0-\u00FF]+[^\s-]*/g, function (match, index, title) {
if (index > 0 && index + match.length !== title.length &&
match.search(smallWords) > -1 && title.charAt(index - 2) !== ":" &&
(title.charAt(index + match.length) !== '-' || title.charAt(index - 1) === '-') &&
title.charAt(index - 1).search(/[^\s-]/) < 0) {
return match.toLowerCase();
}
if (match.substr(1).search(/[A-Z]|\../) > -1) {
return match;
}
// Avoid uppercasing 'mod_deflate', apt-file - kvz
if (match.match(/.[\_\-\/\d]./)) {
return match;
}
// Avoid uppercasing '`frame`', '/sftp/import' - kvz
if (match.match(/(^[`\/]|[`]$)/)) {
return match;
}
// Avoid uppercasing: 'tmpfs' or anything that doesn't have a vowel - kvz
if (!match.match(/[aeiou]/)) {
return match;
}
return match.charAt(0).toUpperCase() + match.substr(1);
});
};
The original source code:
/*
* To Title Case 2.1 – http://individed.com/code/to-title-case/
* Copyright © 2008–2013 David Gouch. Licensed under the MIT License.
*
* https://github.com/gouch/to-title-case/blob/master/to-title-case.js
*/
String.prototype.toTitleCase = function(){
var smallWords = /^(a|an|and|as|at|but|by|en|for|if|in|nor|of|on|or|per|the|to|vs?\.?|via)$/i;
return this.replace(/[A-Za-z0-9\u00C0-\u00FF]+[^\s-]*/g, function(match, index, title){
if (index > 0 && index + match.length !== title.length &&
match.search(smallWords) > -1 && title.charAt(index - 2) !== ":" &&
(title.charAt(index + match.length) !== '-' || title.charAt(index - 1) === '-') &&
title.charAt(index - 1).search(/[^\s-]/) < 0) {
return match.toLowerCase();
}
if (match.substr(1).search(/[A-Z]|\../) > -1) {
return match;
}
return match.charAt(0).toUpperCase() + match.substr(1);
});
};