I would like to extract the number nearest to a section. In this regex
\d+?[\r\n]+(.*)3.2.P.4.4.\s+Justification\s+of\s+Specifications
Objective - Trying to find a section that starts with a number and ends with a given section name. In this case, the section name is ( 3.2.P.4.4. Justification of Specifications)
Actual Result - Regex matches all content since the pattern starts with a number. Expected Result - Regex Should start from 29 which is the nearest number till the section. I tried numerous options like ungreedy quantifiers etc, but none seems to be working.
You might use a negative lookahead to assert that the next line does not start with whitespace chars followed by digits and a newline:
^ \d+[\r\n](?:(?!\s+\d+[\r\n]).*[\r\n])*3\.2\.P\.4\.4\.\sJustification\s+of\s+Specifications
See a regex .NET demo | C# demo
Explanation
^ Start of string\d+[\r\n] Match space, 1+ digits and newline(?: Non capturing group
(?! Negative lookahead to assert what follows is not
\s+\d+[\r\n] Match 1+ whitespace chars, 1+ digits and newline) Close negative lookahead.*[\r\n] Match any char ending with a newline)* Close non capturing group and repeat 0+ times3\.2\.P\.4\.4\.\sJustification\s+of\s+Specifications Match section name