<dependency>
  <groupId>org.specs2</groupId>
  <artifactId>specs2-matcher_2.12</artifactId>
  <version>4.12.6</version>
</dependency>

implementation 'org.specs2:specs2-matcher_2.12:4.12.6'

implementation("org.specs2:specs2-matcher_2.12:4.12.6")

libraryDependencies += "org.specs2" % "specs2-matcher_2.12" % "4.12.6"

@Grapes(
  @Grab(group='org.specs2', module='specs2-matcher_2.12', version='4.12.6')
)

<dependency org="org.specs2" name="specs2-matcher_2.12" rev="4.12.6" />

[org.specs2/specs2-matcher_2.12 "4.12.6"]

'org.specs2:specs2-matcher_2.12:jar:4.12.6'