Hello!
How to capture all values?
Regex: /\{\S+\}/g // https://regexr.com
The /g isn't regex syntax. That's syntax that some languages use to control the construction/mode of the regex itself.
I tried to make as few changes as possible: Rust Playground
Note that you aren't using capturing groups here, so there is no reason to use captures.
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@BurntSushi thx for your reply. 
I have a new problem. I would like to replace a {key} for value.
Keys and values are stored in HashMap.
The second example here should help: Regex in regex - Rust
Here's an updated playground: Regex in regex - Rust
@BurntSushi Incorrect link?
Ah whoops, here it is, thank goodness the playground saves the last program I type. 
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