How to perform regular expression matching in java

How to match regular expressions in Java: First open the eclipse software; then use d to match numbers. If a blank character is encountered in the string, you can use s to match; then match the square brackets The content within a certain range needs to be matched with an inverted triangle symbol.

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Java regular expression Formula matching method:

1. First, we open the eclipse software and take a look at the wildcard characters. As shown in the figure below, the decimal point means matching any character

2. Next, let’s take a look at how to match numbers. As shown in the figure below, use d to match numbers.

3. If you encounter If there are blank characters, then we can use s to match, as shown in the figure below

4. Next, if you want to match a certain range of content, you can use square brackets As shown in the figure below, only the content in the brackets can be successfully matched

5. Of course, if there are too many matching contents in the brackets, we can also use horizontal lines. Expression, as shown in the figure below, will identify the letters matching a to z

6. Finally, if you want to match content that is not within a certain range, you need to use inversion Triangle symbol, as shown in the picture below

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