CODEWITHSUNDEEP
javascriptregexnode.jsmongodb
Miquel
Miquel

Reputation: 8969

String pattern to regex

I'm using mongodb to store data. I would like to store complete regular expressions as strings:

{
  permissions: [{
    resName: '/user[1-5]/ig',
    isRegex: true
  }]
}

I know there is the module mongoose-regexp which can store RegExp, but I would like to store regex and strings in the same field.

I've achieved it using eval(user.permissions[i].resName).test(resName). I would like to know if this is the correct approach and if there is any alternative (i.e. using new RegExp(...))

EDIT

I'm trying to avoid eval as this field is comming from user input and it could be a problem if something malitious is sent to db.

Upvotes: 1

Views: 65

Answers (1)

Phil
Phil

Reputation: 164798

This should get you there

const rxFinder = /^\/(.+)\/((g|i|m|u|y)*)$/
const resName = '/user[1-5]/ig'

const resRx = new RegExp(...rxFinder.exec(resName).slice(1))

console.info(resRx)

const testStrings = ['String for User5, eh', 'Bad User7 string']

testStrings.forEach(str => {
  console.info(JSON.stringify(str), 'is a match:', resRx.test(str))
})

Upvotes: 2

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