How to Match \\r and \\n Without Using [\\r\\n]?

Matching r and n without [rn]

When attempting to match the newline characters r and n using v (vertical white space), one may encounter unexpected results. However, there are several alternatives to achieve this match.

Alternatives:

R (Unicode Newline Sequence):

• By default, R matches Unicode newline sequences in the ASCII range.
• Using the u (unicode) modifier extends the match to include newline characters outside the ASCII range.
• For instance:

<code class="php">preg_match('~\R~', $string); // Matches any Unicode newline sequence in ASCII range
preg_match('~\R~u', $string); // Matches any Unicode newline sequence</code>

(*ANYCRLF) R:

• This variation restricts R to match only CR, LF, or CRLF.
• For example:

<code class="php">preg_match('~(*BSR_ANYCRLF)\R~', $string); // Matches only CR, LF, or CRLF</code>

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