Possible Duplicate:
Case insensitive regex in javascript
Right now I have this:
my_list.match(new RegExp("(?:^|,)"+my_name+"(?:,|$)")))
Which, given the following:
my_list = "dog, cat, boy"
my_name = "dog"
Would return true.
However if I have
my_list = "Dog,Cat,boy"
and
my_name = "boy"
The regex wouldn't match. How would I adapt in order to be able to match with case insensitive?
First off: Never build a regular expression from an unescaped variable. Use this function to escape all special characters first:
RegExp.quote = function(str) {
return str.replace(/[.?*+^$[\]\\(){}|-]/g, "\\$&");
};
It modifies the RegExp object, you need to include it just once. Now:
function stringContains(str, token) {
var
spaces = /^\s+|\s+$/g, // matches leading/trailing space
token = token.replace(spaces, ""), // trim the token
re = new RegExp("(?:^|,)\\s*" + RegExp.quote(token) + "\\s*(?:,|$)", "i");
return re.test(str);
}
alert( stringContains("dog, cat, boy", " Dog ") );
Note
"i" that makes the new RegExp case-insenstive.\s* that allow white-space before/after the comma."(?:^|,)\\s*" is correct, not "(?:^|,)\s*"" (in a JS string all backslashes need to be escaped).