如何使用正则表达式提取器从JMeter中的字符串中提取固定数量的字符？

Question

I have the following part of a JSON response:

"created_at":"2017-05-08T14:01:25.903Z"

How should I configure my "Regular Expression Extractor" in JMeter to extract the first 10 characters from this JSON response: 2017-05-08 .

Answer 1

尝试以下模式：

"created_at":"([0-9]{4}-[0-9]{2}-[0-9]{2}).*?"

Answer 2

If the syntax is always the same, you can use this one :
\\d{4}-\\d{2}-\\d{2}

Demo here

Answer 3

If you need first 10 characters only the relevant regular expression would be as simple as

"created_at":"(.{1,10})

Demo:

References:

• Apache JMeter: Regular Expressions
• Perl 5 Regex Cheat sheet
• Using RegEx (Regular Expression Extractor) With JMeter