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Returns a string that is a substring of the specified string. #### Syntax substring( string , begindex ) string.substring( begindex ) substring( string , begindex , endindex ) string.substring( begindex , endindex ) #### Parameters
string | the string to use.
begindex | the beginning index, inclusive.
endindex | the ending index, exclusive. If endindex is not specified, copies to end of string.
#### Returns
string | a new string.
#### Notes Copies endindex - begindex characters. #### Example
    s = s.substring( offset )
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