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Catastrophic Backtracking Solution
^
(
[^,\r\n]
*
,
)
{11}
P
Options: ^ and $ match at line breaks
Assert position at the start of the string or after a line break character
Match the regular expression below and capture its match into backreference number 1
Exactly 11 times
Note: You repeated the backreference itself. The backreference will capture only the last iteration. Put the backreference inside a group and repeat that group to capture all iterations.
Match a single character not present in the list: one of the characters ",", or a carriage return, or a line feed
Between zero and unlimited times, as many times as possible, giving back as needed (greedy)
Match the character "," literally
Match the character "P" literally
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