Regular expression for not allowing spaces in the input field

Question

I have a username field in my form  I want to not allow spaces anywhere in the string  I have used this regex   var regexp      S     This works for me if there are spaces between the characters  That is if username is ABC DEF  It doesn t work if a space is in the beginning  e g   lt space gt  lt space gt ABC   What should the regex be

User · Answer

Use   plus sign  Match one or more of the previous items    var regexp      S

User · Answer

If you re using some plugin which takes string and use construct Regex to create Regex Object i e new RegExp    Than Below string will work      S      It s same regex  Bergi mentioned just the string version for new RegExp constructor

User · Answer

This will help to find the spaces in the beginning  middle and ending   var regexp     s g

User · Answer

This one will only match the input field or string if there are no spaces  If there are any spaces  it will not match at all       A-z0-9       amp       lt  gt       lt  gt      -               s  1     Matches from the beginning of the line to the end  Accepts alphanumeric characters  numbers  and most special characters   If you want just alphanumeric characters then change what is in the    like so       A-z      s  1

User · Answer

While you have specified the start anchor and the first letter  you have not done anything for the rest of the string  You seem to want repetition of that character class until the end of the string   var regexp      S        a string consisting only of non-whitespaces

[javascript] Regular expression for not allowing spaces in the input field

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