如何只替换指定的字符

Question

例如：

specified_character = "你好啊"
str_to_replace1 = "你好啊朋友"
str_to_replace2 = "你好啊"

我希望正则表达式匹配整个specified_character。它说只有str_to_replace2才匹配。我目前有：

/(?<=[^\p{Han}])#{specified_character}(?=[^\p{Han}])/

结果：

str_to_replace1 = "你好啊朋友"
str_to_replace2 = "new text"

Answer 1

您需要添加一个锚点来开始（^）和结束（$）

pattern = /^Apple$/
'Apple'.gsub(pattern, 'Orange') # => 'Orange'
'Apple Pie'.gsub(pattern, 'Orange') # => 'Apple Pie'

Answer 2

如果您想查看字符串是否与模式相同，那么您根本不应该使用正则表达式。只需使用字符串比较==。

specified_character = "你好啊"
str_to_replace1 = "你好啊朋友"
str_to_replace2 = "你好啊"

str_to_replace1 == specified_character # => false
str_to_replace2 == specified_character # => true