Scala split string regex pattern

Question

I have a String that looks like this and I want to extract the bit between the pipe and the tilde.

{>}D003 S/N|555555~EB

So the result of the parsing should give me 555555 back. Here is what I tried, but without success:

"""\D003 S/N|.*\~""".r.findFirstIn("{>}D003 S/N|555555~EB")

which gives me:

Some({>}D003 S/N|555555~)

Wiktor Stribiżew · Accepted Answer · 2017-01-05 10:45:23Z

2

You may use a simple unanchored regex with a capturing group: D003 S/N\|([^~]+)~.

See the Scala demo:

val rx = """D003 S/N\|([^~]+)~""".r.unanchored
val s = "{>}D003 S/N|555555~EB"
val res = s match { 
    case rx(c) => c
    case _ => ""
}
println(res)

Pattern details:

D003 S/N\| - match a literal char sequence D003 S/N|
([^~]+) - capturing group 1 matching 1 or more chars other than ~
~ - a literal char ~.

edited Jan 5, 2017 at 10:45

answered Jan 5, 2017 at 10:19

Wiktor Stribiżew

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4 Comments

joesan Over a year ago

But I could also have Strings that contain "{>}D004 S/N|555555~EB" instead of "{>}D003 S/N|555555~EB". So I would only like to parse the ones with a D003 S/N on it. How could I do that?

Wiktor Stribiżew Over a year ago

Check if the input string contains D003 S/N in it and only then extract the value. If the value comes before the number, just add it to the regex: """D003 S/N.*\|([^~]+)""".r.unanchored. See this demo.

Jish Nair Over a year ago

But it still matches for messages without tild, "{>}D003 S/N|55555 EB. I want both conditions to be matched.

Wiktor Stribiżew Over a year ago

Nothing easier, just add it at the end of the pattern :) I will update the answer now, since you clarified the requirements. ... Done.

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