GREP: don't select/exclude character after find result?

[turner111]

I have a doc full of text without spaces after colons, e.g. "Next Step:Organize Tools."

I want to add a space after the colon.

Terms like "Next Step" appear regularly throughout, and are easy to find; additionally, there are URLs in which I don't want to add space after a colon.

- - -

So, I can search for "Step:\S" which finds the colons, but it also selects the next letter, e.g. "Next Step:Organize Tools."

- - -

How do we tell GREP to NOT select the next character, and simply add a space after the colon?
FWIW I have the GREP in InDesign book, but don't know what this function is called & couldn't find it... 

Thanks!

[Robert at ID-Tasker]

https://creativepro.com/topic/grep-tricks-using-lookbehind-and-lookahead-expressions-to-convert-a-sp...

[Robert at ID-Tasker]

Or rather this - Positive Lookahead:

https://carijansen.com/positive-lookahead-grep-for-designers/

[FRIdNGE]

Grep Find: :(?=\S)

Grep Replace by: $0 

($0 followed by a normal space)

(^/)  The Jedi

[turner111 · Accepted solution]

Thanks @Rob @FRIdNGE 
I looked a bit closer at the book and indeed kind of found this solution, for example:

Find Step:(?=\S)

Replace Step:_    (that's just a space, not an underscore.)

@FRIdNGE , this seems to work, but is there an advantage to using $0?  I think you're maybe just referring to the find result?

[FRIdNGE]

Yes! You simply search ":"

(^/)

[turner111]

Wouldn't that find every instance of ":" though?

[FRIdNGE]

The regex will find ALL the ":" followed by a char that is a "\S"

That means no catch if the ":" is followed by a normal space, a no-break space, a tab, a carriage-return, a soft-return, …

(^/)