如何只需更換指定的字符

Question

例如：

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

我想一個正則表達式匹配只是整個specified_character。它說只有str_to_replace2將匹配。我目前有：

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

結果：

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

Answer 1

您需要添加一個錨開始（^）和結尾（$）

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

Answer 2

如果你想看看是否字符串與模式相同，那麼你根本不應該使用正則表達式。只需使用字符串比較==。

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