Scala - combination patterns in combination

I have a trait like this: trait Identifiable { def id: Option[Long] } and then there are some other case classes which extend the Identifiable trait. for example: case class EntityA(id: Option[Long], name: String, created: Date) extends Identifiable

What is the reason for match.error?

type Occurrences = List[(Char, Int)] val lard = List(('a', 1), ('d', 1), ('l', 1), ('r', 1)) val r = List(('r', 1)) def subtract2(x: Occurrences, y: Occurrences): Occurrences = x.foldLeft(List[(Char, Int)]())({case (acc, list) if(!(y.contains(list)))

Type matching scala

object Test1 extends App { object specificTypes extends Enumeration { type specificTypes = Value val Red = Value val Green = Value val Blue = Value } abstract class outer { type T <: Test1.specificTypes.Value def pr(w: T) } class red extends outer {

Find a digital model R

I would like the find the pattern of either a 0/1 followed by a 2 which occurs more than three times in a row. I would like to find this pattern and transform the 2's in this pattern into 1s - such as Input: Y <- c(0,1,0,3,2,5,2,1,2,0,2,1,2,0,1,2,1,3

Get a string after the character '/'

I want to extract the string after the character '/' in a PostgreSQL SELECT query. The field name is source_path, table name is movies_history. Data Examples: Values for source_path: 184738/file1.mov 194839/file2.mov 183940/file3.mxf 118942/file4.mp4

Pattern match matrix

This fails to compile: Array[Byte](...) match { case Array(0xFE.toByte, 0xFF.toByte, tail @ _* ) => tail } I can, however, compile this: val FE = 0xFE.toByte val FF = 0xFF.toByte bytes match { Array( FE, FF, tail @ _* ) => tail } Why does the first

string of quotation marks with at least 1 uppercase characters

i have some string lines in my java files and trying to do an Eclipse Regex search but its not working. i want to highlight lines which have an Uppercase character in the string after RequestParam(value = so from below 3 lines, only middle one should

Scala pattern matching extractators

I'm currently playing around with Scala's pattern matching. What I know so far is, that an extractor named like an operator gets left associative and an extractor named like a method or type is right associative. My current approach looks something l

Synchronization with multiple regex

Let's say I have two Java Patterns, one for finding whitespace at the beginning of the line, and the other for finding non-whitespace at the beginning of the line: Pattern ws = Pattern.compile("^\\s+"); Pattern nws = Pattern.compile("^\\S+&

Retrieve the type parameter in pattern matching in scala

I already found that it is possible to bind the type parameter in a pattern matching Why does not that work in that case ? trait T case class S[A](a: A) extends T def pr(t1: T, t2: T) = (t1, t2) match { case (S(a): S[ta], S(b): S[tb]) => println(a);

awk reverse the regular expression expression rule

i have code like this: awk '(/\/\*\!/),(/\*\/\;/)' that will match everything like this: /*!40101 SET character_set_client = utf8 */; /*!40101 SET character_set_client = @saved_cs_client */; /*!50001 CREATE TABLE `sometable` ( `id` int(11), `name` ch

Verify that all lines match the regex pattern in Java

How to check that all lines match regex pattern in Java. I mean that I be able to split lines myself in while loop. But is there any library or standard API, which implement this functionality? UPDATE This is Ruby solution: if text =~ /PATTERN/ Here'

Regex - Negative Look Behind Anywhere Online

How do I match a pattern only if there isn't a specific character before it on the same line? I have the following regex code: pattern = @"(?<=^|[\s.(<;])(?<!//)(" + Regex.Escape(keyword) + @")(?=[\s.(>])"; replacement = &q

Possible match for (apparently) invalid Lua-pattern

I know that you can't repeat match groups in Lua. For example, if I wanted to match the two successive "45"'s, I can't do: print(string.find("some 4545 text", "(%d%d)+")) which will print nil (no match found). However, since

.htaccess rewrite simple does not work

For some reason this isn't working, am I missing something obvious? RewriteRule ^(.*)infopopup.html$ /acatalog/infopopup.html I guess you need to exclude your target file from the RewriteRule because this may cause an infinite loop of rewrites: Rewri

Implementation of NPlusK models in Scala

I thought I could implement n+k patterns as an active pattern in scala via unapply, but it seems to fail with unspecified value parameter: k object NPlusK { def apply(n : Int, k : Int) = { n + k } def unapply(n : Int, k : Int) = { if (n > 0 &&

Template to match the list of identical items

I am looking for a pattern that matches a (possibly empty) list consisting of identical (in the sense of Equal[]) atomic objects, but I can't figure it out. Any help would be greatly appreciated.All of the responses so far seem to have missed the req

How to write this regular expression in Lua?

I'm new to the Lua regex equivalence features, I need to write the following regular expression, which should match numbers with decimals \b[0-9]*.\b[0-9]*(?!]) Basically, it matches numbers in decimal format (eg: 1, 1.1, 0.1, 0.11), which do not end

Processing regular expression matches before replacing

I'm looking for applications and programming language constructs to search for a regular expression pattern, transform the match in some way and then replace it. A very simple example: Transforming "myCamelCasedString" to "my_camel_cased_st

Using sed with html data

I'm having some problems using sed in combination with html. The following sample illustrates the problem: HTML="<html><body>ENTRY</body><html>" TABLE="<table></table>" echo $HTML | sed -e s/ENTRY/$T

c # example of longest common words

i am looking for a longest common words c# implementation. Most of the samples i have came across are comparing character by character. in otherwords, string1 = access string2 = advised should return null output from the function any sample codes?If

Case insensitive correspondence on channel lists

I'm trying to parse command line arguments in an F# application. I'm using pattern matching over parameters list to accomplish it. Something like: let rec parseCmdLnArgs = function | [] -> { OutputFile = None ; OtherParam = None } | "/out" ::

Variable substitution in matching models?

I'm developing an inference engine, this means that basically I have a certain number of "facts" which are basically the representation of the world in a certain moment. Together with the facts (that usually are only two, the starting state and

Can you nest a & ldquo; double against and d? match pattern?

I want to strengthen a pattern to match only numbers which pass an additional validation function. let (|IsValid|_|) n = ... let (|Nil|One|Two|) (l : int list) = match l with | a :: b :: t -> Two(a + b) | a :: t -> One(a) | _ -> Nil The 'One' cas