\\the literal \ (9210 / 1348 / 5C16)
addthe literal text add (case sensitive) \s*any whitespace character, repeated any number of times
\[the literal [ (9110 / 1338 / 5B16)
.*any character, repeated any number of times
]the literal ] (9310 / 1358 / 5D16)
\s*any whitespace character, repeated any number of times
{the literal { (12310 / 1738 / 7B16)
.*?any character, repeated any number of times
\\the literal \ (9210 / 1348 / 5C16)
end{the literal text end{ (case sensitive) .any character
Negated Character Class[^\s]*? *?matches any number of characters outside the set below:
\sany whitespace character
s modifier: single line. Allows a dot to match line terminators