/ Published in: Regular Expression
The first part enclosed in parens is a lookbehind matching the word "new" followed by a space. Next is a block matching any non white space characters bordered by zero or more spaces. Last is a lookahead block matching zero or more square brackets or parens. This excludes things like arrays and constructor parameters from the return. (for example, "new string[5]" will just return "string".
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(?<=new\s)\s*\S*?\s*(?=[\[\(])
URL: http://docs.python.org/lib/re-syntax.html