Regular Expressions 101

Group 1(\d{14}\s.*(?:\n*(?!^\d{14}).*)*)

\d{14}a digit, repeated exactly 14 times

\sany whitespace character

.*any character (except for line terminators), repeated any number of times

Non-Capturing Group(?:\n*(?!^\d{14}).*)*

*repeats the group contents below any number of times:

\n*a line-feed (newline) character (ASCII 10), repeated any number of times

Negative Lookahead(?!^\d{14})

^start of line

\d{14}a digit, repeated exactly 14 times

.*any character (except for line terminators), repeated any number of times

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

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Regular Expression

(\d{14}\s.*(?:\n*(?!^\d{14}).*)*)

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