Regular expression for matches of spaces not preceded by commas

Question

I need to convert a string as follows:

tag, tag2, longer tag, tag3 

in

 tag, tag2, longer-tag, tag3 

To do this briefly, I need to replace spaces without commas with hyphens, and I need to do this in Javascript .

Answer 1

I think this should work

 var re = new RegExp("([^,\s])\s+" "g"); var result = tagString.replace(re, "$1-"); 

Edit: Updated after observing Blixt.

Answer 2

mystring.replace(/([^,])\s+/i "$1-"); There's a better way to do this, but I can never remember the syntax

Answer 3

[^,] = Not a comma

Change Sorry, do not notice the replacement before. I updated my answer:

 var exp = new RegExp("([^,]) "); tags = tags.replace(exp, "$1-"); 

Answer 4

 text.replace(/([^,]) /, '$1-'); 

Answer 5

Unfortunately, Javascript does not seem to support negative images, so you need to use something like this (changed from here ):

 var output = 'tag, tag2, longer tag, tag3'.replace(/(,)?t/g, function($0, $1){ return $1 ? $0 : '-'; }); 

Answer 6

([^,]) - the first character is not a comma, the second character is a space, and it searches for such a string

Answer 7

 ([a-zA-Z] ){1,} 

May be? Not tested. something like that.