如何在PHP中制作正则表达式？

Question

How to make regular expression in PHP? Can anyone guide me to the basic rules to make regular expressions?

Answer 1

http://php.net/manual/en/function.preg-match.php

http://php.net/manual/en/function.preg-replace.php

php.net in general has the entire documentation for the php language. It's probably one of the more valuable resources available.

Answer 2

You will get basic details of expression content here

Table 1. Common regex operators

1. . (period) Match any single character
2. ^ (caret) Match the empty string that occurs at the beginning of a line or string
3. $ (dollar sign) Match the empty string that occurs at the end of a line
4. A Match an uppercase letter A
5. a Match a lowercase letter a
6. \\d Match any single digit
7. \\D Match any single nondigit character
8. \\w Match any single alphanumeric character; a synonym is [:alnum:]
9. [AE] Match any of uppercase A, B, C, D, or E
10. [^AE] Match any character except uppercase A, B, C, D, or E
11. X? Match none or one capital letter X
12. X* Match zero or more capital Xes
13. X+ Match one or more capital Xes
14. X{n} Match exactly n capital Xes
15. X{n,m} Match at least n and no more than m capital Xes; if you omit m, the expression tries to match at least nXes
16. (abc|def)+ Match a sequence of at least one abc and def;abc and def would match

for more details use following link Mastering regular expressions in PHP

Answer 3

A good start would be the PHP manual for regular expressions:

Regular Expressions (Perl-Compatible)

There are three major use cases for regular expressions:

• Searching: preg_match
• Replacing: preg_replace
• Splitting: preg_split

Answer 4

查阅本正则表达式教程及其PHP部分，以获取有关如何在PHP中使用正则表达式的详细信息。

Answer 5

请参阅PHP的PCRE函数书 ，特别是有关PCRE模式语法的章节。

Answer 6

Here are a couple tutorials on using regular expressions in PHP that will get you started:

• Regular Expressions (Part1) - Basic Syntax
• PHP regular expression tutorial