RegEx to parse lines between two strings in scala

Question

I have a free form text file(Not XML) from which i would like to parse the lines between two patterns. Here is the sample data

<Hi>
col1 col2 col3
1 2 3 
4 5 6
helo how are 

<How>
col1 col2
1 2 
helo hi'

I want to parse the data between each tag i.e <Hi> and the blank line as a single string. Similarly the data between <How> and the blank line as another string.

The regex pattern i tried so far did not work.

val pattern = "^<Hi>(.*)\\n"
val pattern = "^<Hi>(.*)\\s*$"
val pattern = "^<Hi>(.*)"
val pattern = "^<Network>(.*)((\\r\\n|\\n|\\r)$)|(^(\\r\\n|\\n|\\r))|^\\s*$"

Is there a way i can specify a pattern for the blank line. Any help is appreciated.

Try searching for the "DOTALL" modifier for regular expressions. Have a go with that and if you get stuck, update the question. Also, can you post the code that you are using to execute the regular expression and print the results. — GMc
– GMc, Commented May 20, 2019 at 7:48

Identity1 · Accepted Answer · 2019-05-20 09:26:37Z

4

Use this instead: [^\>]+(?=\n{2,}|$|\<). Remember to use the global flag to find all matches. You can take a look at the explanation here:

https://regexr.com/4e9c1

edited May 20, 2019 at 9:26

answered May 20, 2019 at 7:58

Identity1

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Pushpesh Kumar Rajwanshi · Accepted Answer · 2019-05-20 07:58:12Z

4

You can use this regex and capture your data from group1,

<[^>]+>\s*([\w\W]*?(?=\n\n|$))

Regex Demo

Explanation:

<[^>]+>\s* - Start capturing the tag using <[^>]+> and optional whitespace(s) with \s*
([\w\W]*? - Capture any characters including newlines in non-greedy manner
(?=\n\n|$)) - Positive look ahead to ensure the match stops as soon as it sees two newlines or absolute end of string

answered May 20, 2019 at 7:58

Pushpesh Kumar Rajwanshi

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jwvh · Accepted Answer · 2019-05-20 09:15:53Z

3

Solution in code.

val src = io.Source.fromFile("so.txt")

"(?s)>\\s*(.+?)(?=\n\n|$)".r
                          .findAllMatchIn(src.mkString)
                          .map(_.group(1))
                          .mkString("->", "<-\n->", "<-")
//res0: String =
//->col1 col2 col3
//1 2 3
//4 5 6
//helo how are <-
//->col1 col2
//1 2
//helo hi'<-

src.close()

answered May 20, 2019 at 9:15

jwvh

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