How do I use regular expressions with user defined input?

Question

0.00/5 (No votes)

See more:

Hello there,

SO I am new to JavaScript and I am trying to wrap my hands around Regular Expressions. Essentially what I am trying to do is, making user to type a sentence and check if that statement contains the word 'hello'. And I am not able to do so. If anyone could please help me out with the same. I have given my code below.

What I have tried:

JavaScript

var a = /hello/;

var b = parseInt(prompt("Type your sentence"));

  if(a.test(b)){

    alert("yes");
}

Posted 5-Apr-18 1:21am

Member 13748876

Updated 5-Apr-18 1:51am

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Jochen Arndt · Accepted Answer · 2018-04-05T01:52:00

Read the documentation: RegExp - JavaScript | MDN[^] and RegExp.prototype.test() - JavaScript | MDN[^]. There you can find examples which you should try out first to become familiar with regular expressions and the syntax.

After doing so you should know that you need two variables:

A regular expression (your var a)
A string to be tested (your var b)

Observe that the second must be a string. But you are using parseInt() - JavaScript | MDN[^] which returns an integer. So just use

JavaScript

var b = prompt("Type your sentence");