I would like to find out if certain substrings exists in a string.

I have tried this:

x = "AAABBBCCC"
x.match(/(AAA|CCC)/)

However this resurns: Array [ "AAA", "AAA" ]

I would like to know exactly which substrings were present (e.g. Array [ "AAA", "CCC" ])

Is this possible?

I would like to find out if certain substrings exists in a string.

I have tried this:

x = "AAABBBCCC"
x.match(/(AAA|CCC)/)

However this resurns: Array [ "AAA", "AAA" ]

I would like to know exactly which substrings were present (e.g. Array [ "AAA", "CCC" ])

Is this possible?

• javascript
• regex

4 Answers 4

Now you have just one capture group with one value and it's returned if found.

If you add global flag to regex it returns all results

x.match(/(AAA|CCC)/g)

-> ["AAA", "CCC"]

check for a global match, otherwise it will break when found the first

x = "AAABBBCCC"
x.match(/(AAA|CCC)/g)

This is possible using the g global flag in your pattern. Like so:

x.match(/(AAA|CCC)/g);

This will return ["AAA", "CCC"]. I really enjoy using RegExr when figuring out expressions and as a documentation.

var regEx = new RegExp('(AAA|CCC)','g');
var sample_string="AAABBBCCC";
var result = sample_string.match(regEx);
document.getElementById("demo").innerHTML = result;

<p id="demo"></p>