I want to split on Red
and red
how can I make split case insensitive?
const str = "my Red balloon"
const searchTxt = "red"
const strArr = str.split(searchTxt);
I've tried variations of
const strArr = str.split(/searchTxt/gi);
Use the RegExp constructor with the desired flags as second argument
RegExp(expression, flags)
Important: when passing arbitrary strings (like from a user input) to the RegExp constructor - make always sure to escape RegExp special characters the RegExp
might confuse as regular expression tokens such as .
( any character ) ?
( one or more ) etc, etc. See the two link-demos below.
const str = "my Red balloon" const searchTxt = "red" const regEscape = v => v.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, '\\$&'); const strArr = str.split(new RegExp(regEscape(searchTxt), "ig")); console.log(strArr)
In order to use a variable in a regular expression, you need to use the RegExp constructor. No need to use the g
flag, since split
will always look for all occurrences:
const str = "my Red balloon" const searchTxt = "red" const strArr = str.split( new RegExp(searchTxt, 'i') ); console.log(strArr);
You need to use a RegExp()
like this:
const str = "my Red balloon"
const searchTxt = "red"
const rgx = RegExp(searchTxt, "gi");
const strArr = str.split(searchTxt);
This is because you can't simply use the /searchTxt/gi
method because it will read it as a string (so it's going to get split where it matches "searchTxt", as a string and not as a variable).
This is the right way
const str = "my Red balloon";
var arr = str.split(/red/i);
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