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(?<a1>\d{10})_(?<a2>\d{10})_(?<a3>\d{10})_(?<a43>\d{10})_(?<a5>\D{4})_(?<a6>\d{2}).(?<a7>\d{2}).(?<a8>\d{4})_(?<a9>\D{2})_(?<a10>\d{2}).(?<a11>\d{2}).(?<a12>\d{4})_(?<a13>\d+).(?<a14>\D{3})

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Named Capture Group a1

(?<a1>\d{10})

\d

matches a digit (equivalent to [0-9]){10} matches the previous token exactly 10 times

_ matches the character _ with index 95_{10} (5F_{16} or 137_{8}) literally (case sensitive)

Named Capture Group a2

(?<a2>\d{10})

\d

matches a digit (equivalent to [0-9]){10} matches the previous token exactly 10 times

_ matches the character _ with index 95_{10} (5F_{16} or 137_{8}) literally (case sensitive)

Named Capture Group a3

(?<a3>\d{10})

\d

matches a digit (equivalent to [0-9]){10} matches the previous token exactly 10 times

_ matches the character _ with index 95_{10} (5F_{16} or 137_{8}) literally (case sensitive)

Named Capture Group a43

(?<a43>\d{10})

\d

matches a digit (equivalent to [0-9]){10} matches the previous token exactly 10 times

_ matches the character _ with index 95_{10} (5F_{16} or 137_{8}) literally (case sensitive)

Named Capture Group a5

(?<a5>\D{4})

\D

matches any character that's not a digit (equivalent to [^0-9]){4} matches the previous token exactly 4 times

_ matches the character _ with index 95_{10} (5F_{16} or 137_{8}) literally (case sensitive)

Named Capture Group a6

(?<a6>\d{2})

\d

matches a digit (equivalent to [0-9]){2} matches the previous token exactly 2 times

. matches any character (except for line terminators)

Named Capture Group a7

(?<a7>\d{2})

\d

matches a digit (equivalent to [0-9]){2} matches the previous token exactly 2 times

. matches any character (except for line terminators)

Named Capture Group a8

(?<a8>\d{4})

\d

matches a digit (equivalent to [0-9]){4} matches the previous token exactly 4 times

_ matches the character _ with index 95_{10} (5F_{16} or 137_{8}) literally (case sensitive)

Named Capture Group a9

(?<a9>\D{2})

\D

matches any character that's not a digit (equivalent to [^0-9]){2} matches the previous token exactly 2 times

_ matches the character _ with index 95_{10} (5F_{16} or 137_{8}) literally (case sensitive)

Named Capture Group a10

(?<a10>\d{2})

\d

matches a digit (equivalent to [0-9]){2} matches the previous token exactly 2 times

. matches any character (except for line terminators)

Named Capture Group a11

(?<a11>\d{2})

\d

matches a digit (equivalent to [0-9]){2} matches the previous token exactly 2 times

. matches any character (except for line terminators)

Named Capture Group a12

(?<a12>\d{4})

_ matches the character _ with index 95_{10} (5F_{16} or 137_{8}) literally (case sensitive)

Named Capture Group a13

(?<a13>\d+)

. matches any character (except for line terminators)

Named Capture Group a14

(?<a14>\D{3})

Your regular expression does not match the subject string.Try launching the debugger to find out why.

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