This code snippet prints "Found a match!" as a single-digit value (in the range of 0 to 9) is present in the string. We can combine these square brackets to obtain more interesting results (such as matching consecutive characters) as illustrated below.

[a-z] matches any character between 'a' and 'z', [0-9] matches any character between '0' and '9'. Since they are placed right next to each other, the match is found consecutively.

Here the third part of the expression, [a-z] did not match the third consecutive character of the pattern. As a result, a matching string was not found.

Characters and digits can also be combined for matching, such as in the following example.

Let's see another metacharacter, a period (.). A period matches any single character occurring at that specific place in a string (except newline character).

The regex 'chips.dip' matches any string which has any single character in-between 'chips' and 'dip', such as the one given in input 'chipsndip' or 'chipsmdip'.

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// Adding a function to wrap the existing code

function findMatch() {

    let s = 'chipsndip';

    if (/chips.dip/.test(s)) {

        console.log("Found a match!");

    } else {

        console.log("Did not find a match.");

    }

}

​

// Driver code to execute the function

findMatch();