If I have a regex with multiple matches like:
var matches = string.match(/\s*(regex1)?\s*(regex2)?(regex3)?\s*/i);
and if the string I'm testing looks like this:
var string = "regex1 regex3";
Is there a way to capture these values in an array:
matches[1] = "regex1";
matches[2] = "";
matches[3] = "regex3";
Note: I want the regex to match the entire string, but fill the array with placeholders for any matches it doesn't find.
Hopefully that's clear. Thank you for your assistance!
Whenever there is a "placeholder" already in place, unmatched groups will result in an array index where the group number matches with an undefined value. For instance,
let someString = "match2";
let matches = someString.match(/\s*(match1)?\s*(match2)?(match3)?\s*/i);
Now, the variable matches contains
["match2", undefined, "match2", undefined]The complete regex match is stored in element 0, while elements 1-3 represent the individual groups.
This allows you to perform actions like this:
// check if group1
if (typeof matches[1] != 'undefined')
If you need to compare a string with regular expressions, simply use an Array join function like this:
matches[1] = "match1";
matches[2] = "";
matches[3] = "match3";
var myString = matches.join("");
You can choose any character to join the array elements. Alternatively, you can also do:
var myString = matches.join(" ");
UPDATE: Based on the problem description, it seems like you want the regex to output an array. For example:
text = "First line\nSecond line";
var regex = /(\S+) line\n?/y;
This would result in:
var match = regex.exec(text);
print(match[1]); // prints "First"
print(regex.lastIndex); // prints 11
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