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Using code to generate regex string procedurally to improve readability.

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gchqdev364 2025-05-12 13:35:39 +00:00
parent 159b80e853
commit bfec582aee
1 changed files with 11 additions and 2 deletions
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13
src/core/operations/ExtractIPAddresses.mjs
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@ -65,8 +65,17 @@ class ExtractIPAddresses extends Operation {
*/ */
run(input, args) { run(input, args) {
const [includeIpv4, includeIpv6, removeLocal, displayTotal, sort, unique] = args, const [includeIpv4, includeIpv6, removeLocal, displayTotal, sort, unique] = args,
// This regex has two major options; decimal values 0-255 or octal values prefixed with 0 up to 377
ipv4 = "(?:(?:(?:25[0-5]|2[0-4]\\d|1?[1-9]\\d|\\d)\\.){3}(?:(?:25[0-5]|2[0-4]\\d|1?[1-9]\\d|\\d)))|(?:(?:(?:0[1-3]?[0-7]{0,2})\\.){3}(?:0[1-3]?[0-7]{0,2}))", // IPv4 decimal groups can have values 0 to 255. To construct a regex the following sub-regex is reused:
ipv4DecimalByte = "(?:25[0-5]|2[0-4]\\d|1?[1-9]\\d|\\d)",
ipv4OctalByte = "(?:0[1-3]?[0-7]{1,2})",
// Each variant requires exactly 4 groups with literal . between
ipv4Decimal = "(?:" + ipv4DecimalByte + "\\.){3}" + "(?:" + ipv4DecimalByte + ")",
ipv4Octal = "(?:" + ipv4OctalByte + "\\.){3}" + "(?:" + ipv4OctalByte + ")",
// Then we allow IPv4 addresses to be expressed either entirely in decimal or entirely in Octal
ipv4 = "(?:" + ipv4Decimal + "|" + ipv4Octal + ")",
ipv6 = "((?=.*::)(?!.*::.+::)(::)?([\\dA-F]{1,4}:(:|\\b)|){5}|([\\dA-F]{1,4}:){6})(([\\dA-F]{1,4}((?!\\3)::|:\\b|(?![\\dA-F])))|(?!\\2\\3)){2}"; ipv6 = "((?=.*::)(?!.*::.+::)(::)?([\\dA-F]{1,4}:(:|\\b)|){5}|([\\dA-F]{1,4}:){6})(([\\dA-F]{1,4}((?!\\3)::|:\\b|(?![\\dA-F])))|(?!\\2\\3)){2}";
let ips = ""; let ips = "";