varname ='wo';
varreg = /^\d " name "\d $/
In order to solve the above-mentioned need to add a variable to the regular expression, we can only use the instance creation method
varreg =newRegExp("^\\d " name "\\d $","g")
What is the difference between literal method and instance creation method in regular expressions?
1. Everything that appears in the literal method is metacharacters, so variable values ??cannot be spliced, but the instance creation method is possible.
2. Just write \d directly in the literal, but in the example it needs to be translated as \\d

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