Matching Multiple rows ^ and $

 ^Match the starting position of a row or string;

In enhancement mode, ^ matches the position after each line break.

 

NOTE: If there are multiple lines of text, for example:

First linesecond line

The actual content is:

First line [Cr] [LF] Second line

[Cr] carriage return
[LF] line feed

Therefore, in the enhancement mode,^It can match the starting position of each line of text. The reason for this explanation is that it conforms to our eye habits.

Note:$This can cause us a headache.

 

$Matches the end position of a string/line, but in enhancement mode,$It can match the linefeed inside the string.

Instance:

Text/string:ABC

Regular Expression:^ ABC $

Matching result:ABC

 

String:

123456

Regular Expression:(? M) ^ \ D {3} $

Matching result:456

Note:(? M)Enable the enhancement mode.

 

Why does the first row 123 fail to match?

Because$The carriage return cannot match.

123 [Cr] [LF] 456

Think about why 123 cannot be matched, and why 456 can be matched.