Kotlin Multiplatform (KMP) library that implements Unicode confusable detection based on Unicode Technical Standard #39 - Unicode Security Mechanisms.

It extends String with:

• toSkeleton(): returns the UTS #39 confusable skeleton (specifically, internalSkeleton).
• isConfusable(other): returns whether two strings have the same skeleton.

[!WARNING] A skeleton is intended only for internal use when testing confusability; it is not suitable for display and should not be treated as a general “normalization” of identifiers.

"paypal".isConfusable("p\u0430yp\u0430l") // => true (Cyrillic 'а')
"ѕсоре".toSkeleton() // => "scope"

repositories {
   mavenCentral()
}

kotlin {
   sourceSets {
      val commonMain by getting {
         dependencies {
            implementation("com.doist.x:confusables:1.0.0")
         }
      }
   }
}

This library embeds data from:

• UTS #39 confusables.txt (Unicode 17.0.0)
• UCD Default_Ignorable_Code_Point (Unicode 17.0.0)

Kotlin tables are generated into build/ at build time from the pinned resources/unicode-data/ inputs.

All Unicode data is subject to Unicode’s Terms of Use.

Run:

./gradlew updateUnicodeData -PunicodeVersion=17.0.0

Released under the MIT License.