A digital sign of stock market information in Hong Kong. More regulations over Chinese internet companies could restrain their growth prospects. Isaac Lawrence/AFP via Getty Images Angst about more Chinese regulations that could restrain companies ’ growth prospects hovers over Chinese internet stocks —and provides a reason for continued caution for bargain-hunters. The Cyberspace Administration of China notified some of the country’s biggest internet companies of new rules that will require them to seek approval for investment deals , The Wall Street Journal reported on Wednesday, citing people familiar with the matter. The internet regulator, on its official WeChat account,...