scala using string interpolation for string replacement

Question

scala 2.11.6

val fontColorMap = Map( "Good" -> "#FFA500", "Bad" -> "#0000FF")
val content = "Good or Bad?"
"(Bad|Good)".r.replaceFirstIn(content,s"""<font color="${fontColorMap("$1")}">$$1</font>""")

I want to replace the String using regex. In this case $$1 can fetch the matched string, but I dont know how to do it in ${}.

plus. I know that scala will translate the interpolation into something like this

new StringContext("""<font color=""",""">$$1</font>""").s(fontColorMap("$1"))

Thus it will fail. But, is there any way I can handle this gracefully?

Alvaro Carrasco · Accepted Answer · 2017-01-24 08:27:23Z

1

You can use the version of replaceAllIn that takes a function:

"(Bad|Good)".r.replaceAllIn(content, m => 
  s"""<font color="${fontColorMap(m.matched)}">${m.matched}</font>"""
)

where m is of type scala.util.matching.Regex.Match.

There doesn't seem to be a version of replaceFirstIn that does the same thing though.

answered Jan 24, 2017 at 8:27

Alvaro Carrasco

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2 Comments

som-snytt Over a year ago

I think that is what OP means.

luchy0120 Over a year ago

Yeah, I only want to replace the first one

chengpohi · Accepted Answer · 2017-01-24 06:17:35Z

0

Seems is caused by regex group variable interpolation with scala StringContext interpolation has the different interpolation order.And StringContext need to evaluate firstly before go to the regex interpolation. Maybe we can try to get value firstly before regex replace interpolation, like:

"(Bad|Good)".r.findFirstIn(content).map(key => {
    val value = fontColorMap(key)
    content.replaceFirst(key, s"""<font color="$value">$key</font>""")
 }).get
 > <font color="#FFA500">Good</font> or Bad?

answered Jan 24, 2017 at 6:17

chengpohi

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