How to Check if a JavaScript String Contains a Substring in a Case Insensitive Manner?

Sometimes, we may want to check if a substring is in a JavaScript string in a case-insensitive manner.

In this article, we’ll check if a JavaScript string has a substring in a case-insensitive manner.

String.prototype.toLowerCase and String.prototype.indexOf

We can convert both the string and the substring we’re checking for the lower case to check if a substring is in a JavaScript string is in a case-insensitive manner.

For instance, we can write:

#javascript

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How to Check if a JavaScript String Contains a Substring in a Case Insensitive Manner?
Lowa Alice

Lowa Alice

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JavaScript Strings Tutorial

JavaScript Strings

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#javascript #strings #javascript strings #javascript strings tutorial

How to Check if a JavaScript String Contains a Substring in a Case Insensitive Manner?

Sometimes, we may want to check if a substring is in a JavaScript string in a case-insensitive manner.

In this article, we’ll check if a JavaScript string has a substring in a case-insensitive manner.

String.prototype.toLowerCase and String.prototype.indexOf

We can convert both the string and the substring we’re checking for the lower case to check if a substring is in a JavaScript string is in a case-insensitive manner.

For instance, we can write:

#javascript

Elisa  Marks

Elisa Marks

1600052203

Javascript String Includes: Check String Contains other String

The string includes() method lets you determine whether or not a  string includes another string.

Javascript String includes()

Javascript string includes() is an inbuilt function that determines whether one string may be found within another string, returning true or false as appropriate. With ES6 JavaScript added the includes method natively to both the Array and String natives. While true or false may provide the answer you need, regular expressions can check if a substring exists with a more detailed answer.

Syntax

See the following syntax.

str.includes(searchString)

#javascript #javascript string includes #js

Javascript String SubString: How to Get SubString in JS

The substring() extracts characters from indexStart up to but not including indexStart in particular. If an indexEnd is omitted, then the substring() extracts characters to the end of a  string. If an indexStart is equal to the indexEnd, then the substring() returns an empty  string.

Javascript String substring()

Javascript string substring() is an inbuilt function that returns a part of the string between the start and end indexes, or to the end of a string.

Syntax

The syntax for the javascript string substring() method is the following.

string.substring(indexStart,indexEnd)

#javascript #javascript string substring #js

Joseph  Murray

Joseph Murray

1624005780

Java: Check if String is a Number

Introduction

Strings are a handy way of getting information across and getting input from a user.

In this article, we will go through a couple of ways check if a String is Numeric in Java - that is to say, if a String represents a numeric value.

Check if String is Numeric with Core Java

Check if String is Numeric with Apache Commons

Check if String is Numeric with Regex

#java #apache commons #java: check if string is a number #check if string is a number #string