verify e911 address

/*Purpose: Verify the format of IP addressInput: Strip:ip AddressReturns: False if return true through validation;*/Java code 1. function f_check_ip (obj)2. {3. Var re=/^ (d+). (d+). (d+). (d+) $/; Regular expressions that match an IP address4. if (Re.test (Obj.value))5. {6. If (regexp.$1 7.}8. F_alert (obj, "Please enter a legitimate computer IP address");9. return false;10.}11. function F_check_ip

Php uses the preg_match () function to verify the IP address. This example describes how php uses the preg_match () function to verify IP addresses. We will share this with you for your reference. The details are as follows: PS: here we will provide two very convenient Regular Expression tools for your reference: JavaScript Regular Expression online testing

First, learn the syntax rules for regular expressions, as follows:The IP address is usually similar: 10.221.105.225 format, cannot start with 0, each field maximum not more than 255, not less than 0IP matching rules:String IP = "([1-9]|[ 1-9][0-9]|1\\D\\D|2[0-4]\\D|25[0-5]) \ \. "+ " ([1-9]|[ 1-9][0-9]|1\\D\\D|2[0-4]\\D|25[0-5]) \ \. "+ " ([1-9]|[ 1-9][0-9]|1\\D\\D|2[0-4]\\D|25[0-5]) \ \. "+ " ([1-9]|[ 1-9][0-9]|1\\D\\D|2[0-4]\\D|25[0-5])

Use a regular expression to verify the email address and mobile phone number Regular Expression, also known as Regular Expression and Regular Expression (English: Regular Expression, often abbreviated as regex, regexp or RE in code), is a concept of computer science. Regular Expressions use a single string to describe and match a series of strings that conform to a certain syntax rule. Regular expression

Use a regular expression to verify the email address and mobile phone number. Regular Expression, also known as Regular Expression and Regular Expression (English: Regular Expression, often abbreviated as regex, regexp or RE in code), is a concept of computer science. Regular Expressions use a single string to describe and match a series of strings that conform to a certain syntax rule. Regular expressio

/// [Original] verify whether the proxy IP address is useful

The main code for verifying the email format is as follows: Public bool isemail (string str_email) { Return System. text. regularexpressions. regEx. ismatch (str_email, @ "^ ([/W-/.] +) @ (/[0-9] {1, 3 }/. [0-9] {1, 3 }/. [0-9] {1, 3 }/.) | ([/W-] + /.) +) ([A-Za-Z] {2, 4} | [0-9] {1, 3}) (/)?] $ "); } The main code for verifying the IP address format is as follows: Public bool ipcheck (string IP) { String num = "(25 [0-5] | 2 [0-4] // d | [0-1] // d