Code + graphics and text explain the common regular matching __spark of Scala in spark

1. Prepare test Data Set

First create a text file, as we test the data, the contents are as follows: except the third column and the fourth column is empty, the rest is the TAB key between the columns, the first row third column and fourth list 1 spaces, the 2nd row third column and fourth listed 2 spaces, the 3rd row third column and the fourth list 3 spaces, The third and fourth columns of line 4th are 4 spaces:

2.\\s matches any number of whitespace characters

Val rdd7 =sc.textfile ("G:\\zhengze.txt")

Val rdd9 = Rdd7.flatmap (_.split ("\\s"))

println (RDD9)
 rdd9.foreach (x => Print (x+ "*"))

The result is as shown in figure:

3.\\s matches any character that is not blank

Val rdd7 =sc.textfile ("G:\\zhengze.txt")

 val rdd9 = Rdd7.flatmap (_.split ("\\s"))

 println (RDD9)

 Rdd9.foreach (x => Print (x+ "*"))

The results are shown in the following illustration:

4.\\d matches any number of numbers

Val rdd7 =sc.textfile ("G:\\zhengze.txt")

 val rdd9 = Rdd7.flatmap (_.split ("\\d"))

 println (RDD9)

 Rdd9.foreach (x => Print (x+ "*"))

The results are shown in the following illustration:

5.\\d matches any number of non-numeric characters

The result is as shown in the figure: