Regex - match a string without having spaces

javascript regex spaces
Justin picture Justin · Feb 10, 2017 · Viewed 13.6k times · Source

Building an regular expression that will reject an input string which contain spaces.

I have a following expression, but its not working as well; 

^[a-zA-Z0-9!@#*()+{}[\\];:,|\/\\\\_\S-]+$

Valid case

String123/test //string without space

Invalid case

String123/ test // contains space in between string 

String 123/test // contains space in between string 

 String123/test  // contains leading\trailing space

i.e; I have to white list strings which does not contain any spaces.

Answer

Sarath Sadasivan Pillai picture Sarath Sadasivan Pillai · Feb 10, 2017

You may use \S

\S matches any non white space character

Regex

/^\S+$/

Example

function CheckValid(str){
   re = /^\S+$/
   return re.test(str)
 }


console.log(CheckValid("sasa sasa"))
console.log(CheckValid("sasa/sasa"))                      
console.log(CheckValid("sas&2a/sasa"))

Related questions

How to validate an email address in JavaScript

Is there a regular expression to validate an email address in JavaScript?

Read More
Check whether a string matches a regex in JS

I want to use JavaScript (can be with jQuery) to do some client-side validation to check whether a string matches the regex: ^([a-z0-9]{5,})$ Ideally it would be an expression that returned true or false. I'm a JavaScript newbie, does …

Read More
How do you use a variable in a regular expression?

I would like to create a String.replaceAll() method in JavaScript and I'm thinking that using a regex would be most terse way to do it. However, I can't figure out how to pass a variable in to a regex. …

Read More