用Golang替换正则表达式

（[^ _] | $）

- 或者非 -

 _ 

或字符串的结尾。

在replaceme nt模式，我们使用反向引用来恢复使用圆括号捕获的字符（捕获组）。

I've used regexp package to replace bellow text

{% macro products_list(products) %}
{% for product in products %}
productsList
{% endfor %}
{% endmacro %}

but I could not replace "products" without replace another words like "products_list" and Golang has no a func like re.ReplaceAllStringSubmatch to do replace with submatch (there's just FindAllStringSubmatch). I've used re.ReplaceAllString to replace "products" with .

{% macro ._list(.) %}
{% for product in . %}
.List
{% endfor %}
{% endmacro %}

It's not sth which I want and I need below result:

{% macro products_list (.) %}
{% for product in . %}
productsList
{% endfor %}
{% endmacro %}

_

var re = regexp.MustCompile(`(^|[^_])\bproducts\b([^_]|$)`)
s := re.ReplaceAllString(sample, `$1.$2`)

Here is the Go demo and a regex demo.

Notes on the pattern:

(^|[^_])^_\bproducts\b([^_]|$)_

In the replacement pattern, we use backreferences to restore the characters captured with the parentheses (capturing groups).

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