replace-regex-groups

replace-regex-groups

A lightweight library to replace the regex groups in a string by a set of replacement values

• Usage
• Input Validation
• License

Usage

$ npm install replace-regex-groups

Indexed capture groups ( unnamed )

const replaceRegexGroups = require('replace-regex-groups')
const regex = /http:\/\/([A-Za-z0-9]*):([0-9]*)\/.*/g
const url = 'http://localhost:8080/foo/bar'
const replacements = ['127.0.0.1', 9090 ]
const replaced = replaceRegexGroups(url, regex, replacements)
// replaced is http://127.0.0.1:9090

Named capture groups

const replaceRegexGroups = require('replace-regex-groups')
const regex = /http:\/\/(?<host>[A-Za-z0-9]*):(?<port>[0-9]*)\/.*/g
const url = 'http://localhost:8080/foo/bar'
const replacements = { host: '127.0.0.1', port: 9090 }
const replaced = replaceRegexGroups(url, regex, replacements)
// replaced is http://127.0.0.1:9090

Dataset pattern replacement

const { readFileSync, writeFileSync } = require('fs')
const replaceRegexGroups = require('replace-regex-groups')
const transactions = readFileSync('./transactions.csv', 'utf8')
const sourcePattern = /(?<reference>[A-Z]{4}.[A-Z0-9]*),(?<period>[0-9]{4}.[0-9]{2}),/gm
const replacements = { reference: 'ANONYMIZED_REFERENCE', period: 'ANONYMIZED_PERIOD' }
const anonymizedTransactions = replaceRegexGroups(transactions, sourcePattern, replacements)
writeFileSync('./anonymized-transactions.csv', anonymizedTransactions)

Input validation

• In case of unnamed capture groups the size of the replacements array must be the same as the capture groups count in the input regex
• In case of named capture groups the keys in the replacements map must be the exact same as the capture groups names of the input regex
• All the regex groups must be of the same kind ( either unnamed or named using ?<GROUP_NAME> syntax )
• For a regex containing named capture groups a replacement map is expected
• For a regex containing unnamed capture groups a replacement array is expected
• Capture groups must not be nested

License

ISC