Function splitRanges

Splits a source string into ranges:

const ranges = splitRanges("hello;there;fella", ";");
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Each range consists of:

{
 text: string  - the text of range
 start: number - start pos of range, wrt to source
 end: number   - end pos of range, wrt to source
 index: number - index of range (starting at 0)
}
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