Check if user typed specific string with variables

Question

To simplify my question using the statement below, how can I have my javascript always print to console what the user typed?

A blip from my code

if (userTyped === 'getname '+ variable) {

Where 'variable' will always equal whatever last half of the string they typed. For example, if a user types "getname 398502" then log it to the console, or if a user types "getname 598024" then log that to the console.

So as long as they typed 'getname ' then print all of what they typed.

Perhaps validate the command with a regular expression, and use capture groups for the command arguments. — Mike Christensen
– Mike Christensen, Commented Feb 4, 2013 at 17:25

Ja͢ck · Accepted Answer · 2013-02-04 17:34:41Z

1

You will want to make sure 'getname ' is at the start of your string:

if (userTyped.indexOf('getname ') === 0) {
    console.log(userTyped);
}

answered Feb 4, 2013 at 17:34

Ja͢ck

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1 Comment

captainrad Over a year ago

I probably explained myself poorly, but this has proven the solution for me! Danke everyone!

Mike Christensen · Accepted Answer · 2013-02-04 17:31:59Z

1

You could use a regular expression to validate the command and extract the argument. Something like:

var input = 'getname 19395029'; //Sample input
var re = /^getname (\d+)$/g;
var match = re.exec(input);
if(match) // Input matches command format
    window.alert('Getting name: ' + match[1]);

answered Feb 4, 2013 at 17:31

Mike Christensen

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Comments

Bruno · Accepted Answer · 2013-02-04 17:36:03Z

1

Try

if( /^getname /i.test( input ) ) { 
    console.log( input.replace( /^getname /i, "" ) ); 
}

Fiddle here

answered Feb 4, 2013 at 17:36

Bruno

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Bergi · Accepted Answer · 2013-02-04 17:32:54Z

0

can equal anything the user typed

Then you don't want to test against a variable (with a certain value). Instead, you want to test the first part against 'getname' and parse the second part into a variable. You can do that using regular expressions, for example:

var match = userTyped.match(/^getname (\d+)$/);
if (match) {
    var variable = match[1]; // maybe parseInt(match[1], 10) ?
}

answered Feb 4, 2013 at 17:32

Bergi

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