Detailed explanation of the use of regular expressions and carriage return and line feed characters

This time I will bring you a detailed explanation of the use of regular expressions and carriage return and line feed characters. What are the precautions for using regular expressions and carriage return and line feed characters? The following is a practical case, let's take a look.

DT 20180101000000
WT -1.1
SL  31.4
WL 203
DT 20180101000000
AT -4.1
BP 1023.7
HU 26
RN     99999.9
WS 1.9 92 2.0 94 3.4 79 2111 4.6 83 2103

regular expression: WT\s (? . )$, the result is that no matching value can be obtained. The reason is that the text content read contains many carriage returns and line feeds "\r\n". For example, in the line WT -1.1, the actual content is

WT -1.1\r\n ". In this case, the line ending character "$" will not work. It should be said that if you directly read the file content and use regular expression matching, it will not work.

WT\s+(?.+)\r\n

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