Merge pull request #72 from zanerock/work-liquid-labs/regex-repo/71

Add 'localhost' RE

Author: zanerock

README.md

@@ -115,6 +115,7 @@ const allColors = cssContent
 - <span id="ipformatre">__`ipFormatRE`__</span>: Matches a string in IP address format. Use 'ipRE' to match actually valid IP addresses.
 - <span id="ipre">__`ipRE`__</span>: Matches a valid, non-localhost IP address.
 - <span id="ipv6re">__`ipV6RE`__</span>: Matches a string in IPV6 format.
+- <span id="localhostre">__`localhostRE`__</span>: Matches any representation of localhost; the special name, IPV4 loopbacks, or IPV6 loopbacks.
 - <span id="subdomainlabelre">__`subdomainLabelRE`__</span>: Matches a registerable domain name. Partially enforces the 63 byte domain label limit, but this is only valid for non-international (all ASCII) labels because we can only count characters. See [domain name rules](#domain-name-rules). When using the partial string to create a RE, you must use the 'u' or 'v' flag.
 - <span id="tldnamere">__`tldNameRE`__</span>: Matches a Top Level Domain (TLD). See [domain name rules](#domain-name-rules). When using the partial string to create a RE, you must use the 'u' or 'v' flag.
 - <span id="urlre">__`urlRE`__</span>: Matches a valid URL. When using the partial string to create a RE, you must use the 'u' or 'v' flag.

src/test/web.test.js

@@ -39,6 +39,12 @@ groupTestPartial(regex.ipFormatREString, goodIPFormats, badIPFormats, 'IP format
 groupTest(regex.ipV6RE, goodIPV6s, badIPV6s, 'IPV6')
 groupTestPartial(regex.ipV6REString, goodIPV6s, badIPV6s, 'IPV6')
 
+const goodLocalhosts = ['127.0.0.1', '127.34.0.255', 'localhost', '::1', '0:0:0:0:0:0:0:1']
+const badLocalhosts = ['128.0.0.1', 'localhosts', '::2']
+
+groupTest(regex.localhostRE, goodLocalhosts, badLocalhosts, 'localhosts')
+groupTestPartial(regex.localhostREString, goodLocalhosts, badLocalhosts, 'localhosts')
+
 groupTest(regex.tldNameRE, goodTLDs, badTLDs, 'TLDs')
 groupTestPartial(regex.tldNameREString, goodTLDs, badTLDs, 'TLDs', undefined, undefined, 'u')
 

src/web.js

@@ -52,6 +52,10 @@ export const ipV6REString =
 // Web: Matches a string in IPV6 format.
 export const ipV6RE = lockdownRE(ipV6REString)
 
+export const localhostREString = `(?:localhost|127(?:\\.${ipTuple}){3}|::1|0:0:0:0:0:0:0:1)`
+// Web: Matches any representation of localhost; the special name, IPV4 loopbacks, or IPV6 loopbacks.
+export const localhostRE = lockdownRE(localhostREString)
+
 // note the 'v' flag breaks on Ubuntu
 export const tldNameREString = `(?:[${uniNonASCII}]|[a-zA-Z${uniNonASCII}][a-zA-Z0-9${uniNonASCII}]{1,62})`
 // Web: Matches a Top Level Domain (TLD). See [domain name rules](#domain-name-rules). When using the partial string to create a RE, you must use the 'u' or 'v' flag.