regex for allowing SINGLE white space in between words

3
votes

I m using the following regex for the same: ^\S.*\S$

but this regex is not working in case of multiple spaces in between words. and one more thing, it doesnt allow you to enter a single character

I want to validate no leading and trailing space and single white space in between words, words can include anything alphanumeric as well as special character.

if i m trying to enter 'a' in the text box, its not accepting

5
regex
"Working" and "not working" suggest you know what you want, but I can't tell from reading this what that is. Provide some examples of input and desired output and you'll get better answers. – Edward
What are you trying to achieve? Post some examples for valid and invalid matches. – Avinash Raj
this regex should give true for following: shashank shekhar – Shashank Shekhar
It will be better if your provide examples here. For input A expected output will be B. – fhnaseer
Add example in your question, not in comments, – fhnaseer

5 Answers

5
votes

Seems like you want something like this,

^\S+(?: \S+)*$

\S matches any non-space character.

DEMO

4
votes

In case only charactors are needed, use this:

^[a-z|A-Z]+(?: [a-z|A-Z]+)*$
0
votes

[A-Za-z]+(\s[A-Za-z]+)? you can use this to put single space between words

0
votes

Just assert that two spaces don't appear;

^(?!.*\s\s)\S(.*\S)?$
0
votes

Below one allows one space between words with some special chars. It also prevent space at starting and end of string.

^([a-zA-Z0-9@.,]+\s)*[a-zA-Z0-9@.,]+$