PHP development skills (12) - Detailed explanation of example codes of commonly used PHP regular expressions

    Regular expression is a logical formula for string operations. It uses some pre-defined specific characters and the combination of these specific characters to form a "regular string". This " "Rule string" is used to express a filtering logic for strings. Today's blog post is a summary of some commonly used PHP regular expressions, so that we can perform form verification, string search, etc. in development in the future.

1. Regular expression for matching mobile phone numbers

Matching rules for mobile phone numbers:
Basic format of mobile phone numbers:
The first three digits are:
Mobile: 134-139 147 150-152 157-159 182 187 188
China Unicom: 130-132 155-156 185 186
Telecom: 133 153 180 189
The last eight digits are: 0-9 Number

2. Regular expression for matching email address

Matching email rule:
The basic format of the email address is *****@**.* *@ is preceded by a string of uppercase and lowercase letters or numbers, followed by 0 to multiple uppercase and lowercase letters or numbers or . _ - and followed by @. Before is a string of 1 to multiple uppercase and lowercase letters or numbers. Followed by a string of 1 to more uppercase and lowercase letters or numbers or .

3. Matching phone number regular expression

Telephone number matching phone number rules:
Area code: 3 to 5 digits, most are four digits , three digits for Beijing (010) and Shanghai (021), and some five digits for Tibet, which can be wrapped in brackets or not. If there is an area code wrapped in brackets, there can be 0 to 1 space between the area code and the number. If the area code is not enclosed in parentheses, there can be a two-digit length or -
number between the area code and the number: a 7 to 8 digit number, for example: (010) 12345678 or (010)12345678 or 010 12345678 or 010-- 12345678

4. Regular expression for matching URL

Matching URL rules:
Protocol://domain name (www/m/wap... ).Name.Suffix/File Path/File Name

Protocol://Domain Name (www/m/wap...).Name.Suffix/File Path/File Name?Parameter

Protocol://Domain name (www/m/wap...).Name.Suffix/File path/File name/Parameters

Protocol: Yes Yes None, consisting of uppercase and lowercase letters; if protocol is not written, :// should not exist, otherwise it must exist://
Domain name: must exist, composed of uppercase and lowercase letters
Name: must exist, alphanumeric Chinese characters
Suffix: must exist, composed of uppercase and lowercase letters and .
File path: optional, composed of uppercase and lowercase letters and numbers
File name: optional, composed of uppercase and lowercase letters and numbers
Parameter: optional, if it exists, it must start with?, that is, if it exists, there must be corresponding parameter information starting with?

5. Regular expression matching ID number

Matching ID number rules:
15 pure digits or 18 pure digits or 17 digits plus one x

6. Matching area zip code Regular expression

Matching zip code rules:
Six digits, the first digit cannot be 0

7, Regular expression matching IP address

Matching IP rules:
**1.**2.**3.**4**1 can be one digit 1-9, two digits 01-99, three digits 001-255**2 and **3 can be one-digit 0-9, two-digit 00-99, three-digit 000-255**4 can be one-digit 1-9, two-digit 01- 99, the four three-digit parameters 001-255 must exist.

8. Regular expression for matching time format

Matching time rules:
The format can be: year-month-day hour:minute:second, Year-month-day hour: minute, year-month-day: year: four digits starting with 1 or 2, month: 1 digit starting with 1 to 9; two digits starting with 0 or 1, time period starting with 0 The digit is a number from 1 to 9. When it starts with 1, the single digit is a number from 1 to 2. Day: The digit is a number from 1 to 9; the two digits start with 0 or 1 or 2 or 3. When the number starts with 0 The digit is a number from 1 to 9. When it starts with 1 or 2, the units digit is a number from 0 to 9. When it starts with 3, the units digit is 0 or 1. Hour: one digit from 0 to 9; starts with 0 or 1 Two-digit numbers starting with 2, the ones digit is 0 to 9; two-digit numbers starting with 2, the ones digit is 0-3 minutes: one-digit number 0 to 9; two-digit numbers starting with 0 to 5, the ones digit is 0 to 9 ; Minutes: one digit from 0 to 9; two digits starting from 0 to 5, each digit is 0 to 9.

9. Regular expressions matching Chinese under utf8

Related articles:

The most commonly used regular expressions in PHP Detailed explanation

php regular code for filtering html tags, spaces, and newlines

php regular replacement variables Method of specifying characters

A brief analysis of examples of PHP regular expression matching, replacement and segmentation functions

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