Do regular expression replace in submatch

[Tong Sun]

The Go by Example: Regular Expressions at https://gobyexample.com/regular-expressions only shows how to do normal regular expression find and replace, but I want to do regular expression replace in submatch. I.e., locate a string range with regular expression find, and do regular expression replace within that range. 

Is that possible? 

I found this, "no way to replace submatches with a function #5690"

https://github.com/golang/go/issues/5690

but I don't need a function if I can make it works. 

Thanks

[Shawn Milochik]

It sounds like you can use one of the Find* methods to locate the substring, then concatenate the string up to that point, the result of one of the Replace* methods for the substring, then the remainder of the string. So, two separate regexp patterns, but it should work.

Can you give sample input and output? Maybe someone will have a better suggestion based on the actual need.

[Tong Sun]

Thanks. The input in that issues/5690 is a good one

Let's say you have strings like

    input := `bla b:foo="hop" blabla b:bar="hu?"`

and you want to replace the part between quotes in b:foo="hop" and

b:bar="hu?", replacing "b:" with "new:", and replacing "hop" with "hope". 

Thanks

On Fri, Jan 15, 2016 at 3:32 PM, Shawn Milochik <shawn...@gmail.com> wrote:

It sounds like you can use one of the Find* methods to locate the substring, then concatenate the string up to that point, the result of one of the Replace* methods for the substring, then the remainder of the string. So, two separate regexp patterns, but it should work.

Can you give sample input and output? Maybe someone will have a better suggestion based on the actual need.

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[Shawn Milochik]

Does this solve your use-case?

http://play.golang.org/p/tu8rbq_dXJ

[Tong Sun]

On Fri, Jan 15, 2016 at 5:08 PM, Shawn Milochik <sh...@milochik.com> wrote:

Does this solve your use-case?

http://play.golang.org/p/tu8rbq_dXJ

Oh, thanks a lot Shawn! 

Actually what I am trying to do is to html-encode a sub-set-part of an XML string. I think your first description is a viable option. 

thanks again.