51 lines
1.1 KiB
Markdown
51 lines
1.1 KiB
Markdown
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---
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title: Ruby String Operations
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localeTitle: Ruby字符串操作
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---
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连接和乘法都可以在字符串上执行。
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## 级联：
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* 可以使用以下任何方法将字符串连接在一起：
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* `+`运算符
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* `<<`运营商
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* `.concat`方法
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```ruby
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"Hello" + " World" + "!" #=> Hello World!
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```
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```ruby
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"Hello" << " World!" #=> Hello World!
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```
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```ruby
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string1 = "Hello"
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string2 = " World!"
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string1.concat(string2) #=> Hello World!
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```
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## 乘法：
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* 可以使用`*`运算符将字符串乘以整数值。 `ruby "Hello" * 3 #=> HelloHelloHello`
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## 替换子字符串
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* 我们可以搜索子字符串或使用Regex搜索和替换字符串中的字符。 `ruby "Hey mom, look at this string".sub('mom', 'dad') #=> Hey dad, look at this string`
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## 比较：
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* 可以比较字符串，返回-1,0，+ 1或nil，具体取决于字符串是否小于，等于或大于other\_string。
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```ruby
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"abcdef" <=> "abcde" #=> 1
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"abcdef" <=> "abcdef" #=> 0
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"abcdef" <=> "abcdefg" #=> -1
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"abcdef" <=> "ABCDEF" #=> 1
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```
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