使用scala替换spark dataframe列中多次出现的字符串的正则表达式

import org.apache.spark.sql.functions._

// 创建一个示例DataFrame
val df = spark.createDataFrame(Seq(
  (1, "Hello, world!"),
  (2, "Hello, Spark!"),
  (3, "Hello, Scala!")
)).toDF("id", "text")

// 定义要替换的字符串和替换后的字符串
val oldString = "Hello"
val newString = "Hi"

// 使用regexp_replace函数进行替换
val replacedDF = df.withColumn("replacedText", regexp_replace(col("text"), oldString, newString))

// 显示替换后的结果
replacedDF.show()

+---+---------------+----------------+
|id |text           |replacedText    |
+---+---------------+----------------+
|1  |Hello, world!  |Hi, world!      |
|2  |Hello, Spark!  |Hi, Spark!      |
|3  |Hello, Scala!  |Hi, Scala!      |
+---+---------------+----------------+