All the errors detected are listed below, from left to right, as they appear in the pattern.
" Delimiter must be escaped with `\`
" Delimiter must be escaped with `\`
" Delimiter must be escaped with `\`
? Quantifier cannot repeat an invalid token
" Delimiter must be escaped with `\`
" Delimiter must be escaped with `\`
" Delimiter must be escaped with `\`
? Quantifier cannot repeat an invalid token