SubstringRegexpDelimiter
SubstringRegexpDelimiter("your text is here now", "[tex]", "here") → "text is here"
SubstringRegexpDelimiter("COMMAND DELETE", "[AND]", "[L]") → "AND DEL"SubstringRegexpDelimiter("your text is here now", "[tex]", "here") → "text is here"
SubstringRegexpDelimiter("COMMAND DELETE", "[AND]", "[L]") → "AND DEL"