StringIndexOutOfBoundsException on particular string

This string (excluding the double quotes) triggers a StringIndexOutOfBoundsException:
"://VIVE MARINE LE PEN//:@."

```
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at java.lang.AbstractStringBuilder.substring(AbstractStringBuilder.java:908) ~[na:1.8.0_60]
at java.lang.StringBuilder.substring(StringBuilder.java:76) ~[na:1.8.0_60]
at java.lang.AbstractStringBuilder.substring(AbstractStringBuilder.java:854) ~[na:1.8.0_60]
at java.lang.StringBuilder.substring(StringBuilder.java:76) ~[na:1.8.0_60]
at com.linkedin.urls.detection.UrlDetector.readDefault(UrlDetector.java:191) ~[url-detector-0.1.17.jar!/:na]
at com.linkedin.urls.detection.UrlDetector.detect(UrlDetector.java:142) ~[url-detector-0.1.17.jar!/:na]
```

The stack trace points to UrlDetector.readDefault at line 191, reached through UrlDetector.detect. Reproduce the failure with the quoted string and inspect the substring handling there; done means this input no longer throws StringIndexOutOfBoundsException during detection.

Written by the indexing model from the issue text.