Regular expression matches any string __ regular expression

(.*?) Match all strings

<p class= "num" >9033</p>

such as using <p class= "(. *?)" >9033</p>

Will get num

However, if a newline character is invalidated, and if a match is required, including a newline character, use the

([\s\s]*)

If you have parentheses or other metacharacters in an expression, you need to use escape. Before the character, add a \

Metacharacters	Description	Example
^	Matches the starting position of the entire string, or the starting position of the line, or the excluded type (negative) character group if it is inside a character group	^start
$	Matches the end position of the entire string, or the end position of the line	end$
()	grouping, providing reverse reference (GOURP1) \1 or multiple-selection branches	(AB) +
* + ?	quantifiers, limiting the number of times before elements appear	+ (AB) +
.	Matches any character other than a newline character by default, and can match line breaks in multiple-line mode
[	Start symbol for character group	[0-9]
\	A backslash is used to represent an escape sequence, or to remove the escape of a meta character	\1
{	Start of the recurrence qualifier	{2, 6}
|	Dividing multiple-selection branches (when parentheses do not appear, you can imagine parentheses appearing at the outermost end of the entire expression)	Tom| Jerry