Strings
=======


.. function:: substr(theString, startIndex, len)

   Returns the substring of *theString* starting at *startIndex* with length *len*, or as much as exists, otherwise an empty string

.. function:: strindex(theString, regexp)

   Returns the index of the first occurrence of *regexp* in *theString*, or -1 if not found.  *regexp* is interpreted as a regular expression: any of the characters ^.[$\'\`()|*+?\\{ must be quoted with a preceeding \\ .  See `<https://man.openbsd.org/re_format>`_ or type "man re_format" in a Terminal window for a detailed description of regular expression.

.. function:: trimWhitespace(theString)

   Returns the substring of *theString* with leading and trailing spaces, tabs, and newlines removed.