带有示例的 Scala String replaceFirst() 方法

replaceFirst()方法与replaceAll相同，但这里只替换所述子字符串的第一次出现。

Method Definition: String replaceFirst(String regex, String replacement)
Return Type: It returns the stated string after replacing the first appearance of stated regular expression with the string we provide.

示例 #1：

// Scala program of replaceFirst()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Applying replaceFirst method
        val result = "csoNidhimsoSingh".replaceFirst(".so", "##")
          
        // Displays output
        println(result)
      
    }
} 

输出：

##NidhimsoSingh

示例 #2：

// Scala program of replaceFirst()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Applying replaceFirst method
        val result = "NidhimsoSinghcso".replaceFirst(".so", "*")
          
        // Displays output
        println(result)
      
    }
} 

输出：

Nidhi*Singhcso

示例#3：

// Scala program of replaceFirst()
// method
  
// Creating object
object GfG
{ 
  
    // Main method
    def main(args:Array[String])
    {
      
        // Applying replaceFirst method
        val result = "fsoNidhimsoSinghcso".replaceFirst(".so", "*")
          
        // Displays output
        println(result)
      
    }
} 

输出：

*NidhimsoSinghcso