Analysis on character locating using PHP Regular Expressions

We often encounter the use of PHP regular expressions to locate characters during development. What types of characters does a PHP regular expression have? What exactly do they represent? Let's start introducing them one by one.

PHP Regular Expressions:

A PHP regular expression is a very important character in a PHP regular expression. It is used to describe the position of a character in a matching object.

The PHP Regular Expression locates the types and meanings of characters:

◆ ^:

Indicates that the matching mode appears at the beginning of the matching object (different from that in)

◆ $:

Indicates that the matching mode appears at the end of the matching object.

◆ Space:

Indicates that the matched pattern appears at one of the two boundaries at the beginning and end.

◆ "/^ He /":

It can match strings starting with "he", such as hello and height;

◆ "/He $ /":

It can match strings ending with "he", that is, "she;

◆ "/He /":

It starts with a space and matches a string starting with "he", just like ^;

◆ "/He /":

End with a space. It matches the string ending with "he", just like "$;

◆ "/^ He $ /":

It indicates that it only matches the string "he.

The following is a brief introduction to the location of PHP regular expressions. I hope you can understand and understand the location of PHP regular expressions.