What is JavaScript Regex?

In this article, we will try to discuss in more detail how using regular expressions can benefit you in the programming sector and How to use Regex in JavaScript Function?

A string is a call of characters on a regular expression that creates a search pattern. Also, text replacement and text search operations can both be performed using the search pattern.

JavaScript Validation

Are you know what form validation is? JavaScript used for a scripting language used for validation and verification enters the picture at this point. Although JavaScript on web pages can be used to validate a form. Also, it should be integrated with HTML. JavaScript is the fundamental technique to learn if you want to know how to comprehend the validations carried out on web pages and the fact that many other languages have entered the picture for validation.

The end-user during the submission of a form is known as form validation by Validating the values submitted. Basically, Regular Expression is crucial in the process of validating a form.

Regular Expression:

A regular evaluation is an object that describes a pattern of letters. For search and pattern matching and replacement operations on text, regular expressions are utilized.

Therefore, JavaScript is quite important in this case for validating values.

JavaScript Replace Regex

Regular Expressions known as RegEx, are a potent tool for text analysis. In this case, the RegEx allows you to compare strings at specific positions where certain characters.

Although the Strings in JavaScript can have characters substituted for certain parts of the string using the .replace method like the below method:

const str = Good morning;
const newStr = str.replace("ood", "-");
// G- morning

Formulation of Regular Expressions

There are two ways we can build a regular expression in JavaScript such as:

Firstly, the forward slashes /…/, used in the same way that quotes “ ” are used to create strings and signify that we are creating a regular expression pattern.

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If you are writing the above code and you are aware of the regular expression pattern, you should use a regex literal.

However, if the regex pattern needs to be generated dynamically and you can use the Regex function Object() { [native code] }.

Secondly, we can use a template literal to create a pattern that is possible with the regex function Object() { [native code] } but not with the literal regex syntax.

Using Regular Expressions

Unique Characters

Now we can say a character with a reserved meaning is referred to as a special character in a regular expression.

And we can accomplish more than just finding a direct match when you use special characters.

For instance, we can use special characters to match a character in a string that might or might not appear once or more than once and characters fall under various subgroups that carry out related tasks.

How Do Character Classes Work?

Hence, to match any one of several characters in a specific position, a character class is used.

We are using square brackets to indicate a character class, and list the characters we want to match inside the brackets.

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Lastly, we can use another method of specifying a group of options through alternation. The pipe character is | and in this case, any subexpression is used to match.

However, an alternative is a subexpression that can be either of the two, and the “or” symbol represented by the pipe matches a number of possibilities. So, you can use subexpressions in combination as an alternative.

For Example:

As an illustration, (x|y|z)a will match xa, ya, or za.

We can use parentheses to group the alternatives together to constrict the scope of the alternation.

x|y|za means either x or y or za without parentheses.


In the end, it is up to you to need to decide if working with regular expressions in JavaScript is worth the effort. As we showed earlier, they can be useful for many scenarios, and we believe the techniques shown here will at least help you find your way around this strong but complex syntax.

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