assertThat("1080:0:0:0:8:800:200C:417A".canParseAsIpAddress()).isTrue()
    assertThat("1080::8:800:200C:417A".canParseAsIpAddress()).isTrue()
    assertThat("FF01::101".canParseAsIpAddress()).isTrue()
    assertThat("0:0:0:0:0:0:13.1.68.3".canParseAsIpAddress()).isTrue()
    assertThat("0:0:0:0:0:FFFF:129.144.52.38".canParseAsIpAddress()).isTrue()
    assertThat("::13.1.68.3".canParseAsIpAddress()).isTrue()

import java.security.interfaces.RSAPrivateKey
import java.security.interfaces.RSAPublicKey
import java.security.spec.PKCS8EncodedKeySpec
import java.util.UUID
import java.util.concurrent.TimeUnit
import okhttp3.internal.canParseAsIpAddress
import okhttp3.tls.internal.der.AlgorithmIdentifier
import okhttp3.tls.internal.der.AttributeTypeAndValue
import okhttp3.tls.internal.der.BasicConstraints
import okhttp3.tls.internal.der.BitString

import java.util.Collections
import java.util.Date
import java.util.GregorianCalendar
import java.util.Locale
import java.util.regex.Pattern
import okhttp3.internal.UTC
import okhttp3.internal.canParseAsIpAddress
import okhttp3.internal.delimiterOffset
import okhttp3.internal.http.MAX_DATE
import okhttp3.internal.http.toHttpDateString
import okhttp3.internal.indexOfControlOrNonAscii

 * verification).
 */
private val VERIFY_AS_IP_ADDRESS = "([0-9a-fA-F]*:[0-9a-fA-F:.]*)|([\\d.]+)".toRegex()

/** Returns true if this string is not a host name and might be an IP address. */
fun String.canParseAsIpAddress(): Boolean = VERIFY_AS_IP_ADDRESS.matches(this)

/**
 * Returns true if the length is not valid for DNS (empty or greater than 253 characters), or if any
 * label is longer than 63 characters. Trailing dots are okay.