What does this regular expression mean? How to solve

What does this regular expression mean? & Nbsp;. (google | youdao) (. [a-z0-9-] +) {1, 2} ig; what does this regular expression mean: What does this regular expression mean?
/\. (Google | youdao) (\. [a-z0-9 \-] +) {} \/ig;

What does this regular expression mean?

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Php regular expressions do not use g modifiers, so this is js regular expressions.
G indicates the entire process. in the String. replace method, all matching items are replaced.
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Match the domain name of google or youdao.