[英]Java - regular expression to check if begins and ends with certain characters
Considering a string in following format,考虑以下格式的字符串,
[ABCD:defg] [MSG:information] [MSG2:hello]
[ABCD:defg] [MSG:信息] [MSG2:你好]
How to write regex to check if the line has '[MSG:' followed by some message & ']' and extract text 'information' from above string?如何编写正则表达式来检查该行是否有 '[MSG:' 后跟一些消息 & ']' 并从上面的字符串中提取文本 '信息'?
Your requirement would be something like你的要求是这样的
/\[MSG:.+\]/ in standard regex notation. /\[MSG:.+\]/ 在标准正则表达式中。 But I would suggest to you that you could use String.indexOf to extract your information
但我建议你可以使用 String.indexOf 来提取你的信息
String str = ...
int idx = str.indexOf("MSG:");
int idx2 = str.indexOf("]", idx);
val = str.substring(idx + "MSG:".length(), idx2);
You can use the regex , \[MSG:(.*?)\]
and extract the value of group(1).您可以使用正则表达式
\[MSG:(.*?)\]
并提取 group(1) 的值。
Demo :演示:
import java.util.regex.Matcher;
import java.util.regex.Pattern;
class Main {
public static void main(String args[]) {
String str = "[ABCD:defg] [MSG:information] [MSG2:hello]";
Matcher matcher = Pattern.compile("\\[MSG:(.*?)\\]").matcher(str);
if (matcher.find())
System.out.println(matcher.group(1));
}
}
Output : Output :
information
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