Flash regular expression usage operation content

php editor Youzi brings you information about the use of Flash regular expressions. Flash regular expressions are a powerful text processing tool that can be used for string search, replacement, extraction and other operations. This article will introduce in detail how to use regular expressions in Flash, and provide several practical application cases to help readers quickly master and flexibly apply regular expression techniques. Whether you are a beginner or an experienced developer, you can gain practical knowledge from this article and improve your skills in Flash development. Let's start this regular expression exploration journey together!

1. The class related to regular expressions is called RegExp. To create a regular expression, you need to use the constructor of the RegExp class. The code in the image below creates a regular expression through RegExp.

2. After the regular expression is created, you can use its test method to perform pattern matching. If the match is successful, true will be output, and if the match fails, false will be output. To match a string [How are you.].

3. Use the trace command to output the results on the stage. You can see that the value is true, that is, the included characters are matched successfully.

4. Next, match a string [68you32]. The code is as shown in the figure.

5. After running the program, true is output, which means the match is successful. This means that when a regular expression is used to match a string, true will be output as long as it contains the string. The position in the string is irrelevant.

6. Modify the matching string slightly.

7. After running the program, false is output, indicating that when matching a string with a regular expression, every character in the string condition must be included, otherwise the match fails.

8. Finally, change part of the characters in the string to be matched to uppercase.

9. Run the program and the output result is false. You can see that the regular expression is case-sensitive during the search process. If the uppercase and lowercase format is incorrect, the match will fail.

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