Scala RegEx match fails, Java one suceeds

Question

In a following code the same pattern matches when Java API is used, but not when using Scala pattern matching.

import java.util.regex.Pattern

object Main ex         


        

Answer 1

When you define a Scala pattern, it is anchored by default (=requires a full string match), while your Java sj.find() is looking for a match anywhere inside the string. Add .unanchored for the Scala regex to also allow partial matches:

val statePattern = statePatternString.r.unanchored
                                       ^^^^^^^^^^^

See IDEONE demo

Some UnanchoredRegex reference:

def unanchored: UnanchoredRegex

Create a new Regex with the same pattern, but no requirement that the entire String matches in extractor patterns.

Normally, matching on date behaves as though the pattern were enclosed in anchors, ^pattern$.

The unanchored Regex behaves as though those anchors were removed.

Note that this method does not actually strip any matchers from the pattern.

AN ALTERNATIVE SOLUTION would mean adding the .* at the pattern end, but remember that a dot does not match a newline by default. If a solution should be generic, the (?s) DOTALL modifier should be specified at the beginning of the pattern to make sure the whole string with potential newline sequences is matched.