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Split a String on Capital Letters in JavaScript # To split a string on capital letters, call the split() method with the following regular expression - /(? =[A-Z])/ . The regular expression uses a positive lookahead assertion to split the string on each capital letter and return an array of the substrings.
To capitalize the first character of a string, We can use the charAt() to separate the first character and then use the toUpperCase() function to capitalize it.
In JavaScript, we have a method called toUpperCase() , which we can call on strings, or words. As we can imply from the name, you call it on a string/word, and it is going to return the same thing but as an uppercase. For instance: const publication = "freeCodeCamp"; publication[0].
I would do this with .match() like this:
'ThisIsTheStringToSplit'.match(/[A-Z][a-z]+/g);
it will make an array like this:
['This', 'Is', 'The', 'String', 'To', 'Split']
edit: since the string.split() method also supports regex it can be achieved like this
'ThisIsTheStringToSplit'.split(/(?=[A-Z])/); // positive lookahead to keep the capital letters
that will also solve the problem from the comment:
"thisIsATrickyOne".split(/(?=[A-Z])/);
.match(/[A-Z][a-z]+|[0-9]+/g).join(" ")
This should handle the numbers as well.. the join at the end results in concatenating all the array items to a sentence if that's what you looking for
'ThisIsTheStringToSplit'.match(/[A-Z][a-z]+|[0-9]+/g).join(" ")
Output
"This Is The String To Split"
Here you are :)
var arr = UpperCaseArray("ThisIsTheStringToSplit");
function UpperCaseArray(input) {
var result = input.replace(/([A-Z]+)/g, ",$1").replace(/^,/, "");
return result.split(",");
}
This is my solution which is fast, cross-platform, not encoding dependent, and can be written in any language easily without dependencies.
var s1 = "ThisЭтотΨόυτÜimunəՕրինակPříkladדוגמאΠαράδειγμαÉlda";
s2 = s1.toLowerCase();
result="";
for(i=0; i<s1.length; i++)
{
if(s1[i]!==s2[i]) result = result +' ' +s1[i];
else result = result + s2[i];
}
result.split(' ');
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