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How do I convert a string into a regular expression

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Post time: 2020-3-3 19:00:02
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For example: I return a string from the background: '(?: <Script. *?>) ((\n |\r |.) *?) (?: <\/ script>)'
   But in Javascript, the way we use Javascript is:
   var reg = /(?:<script.*?>)((\n|\r|.)*?)(?:<\/script>)/, then use the reg test method. . But I don't know how to use strings. .
   So please ask, heroes
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Post time: 2020-5-18 11:45:01
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var reg = new RegExp (string, type); // Pay attention to escaping. . type is optional case-insensitive img
// For example: matching numbers
var num = new RegExp ("\\d");
// match letters a to z (not case sensitive and match multiple)
var r = new RegExp ("[a-z]", "ig");
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 Author| Post time: 2020-6-16 16:30:01
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Someone helped me solve it so quickly, thank you very much. .
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