regex101: PCRE (Legacy) Substitution Workspace

^start of line

Negative Lookahead(?!(?:\s*$|.*(?:Niveau|stime)))

Non-Capturing Group(?:\s*$|.*(?:Niveau|stime))

1st Alternative\s*$

\s*any whitespace character, repeated any number of times

$end of line

2nd Alternative.*(?:Niveau|stime)

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

Non-Capturing Group(?:Niveau|stime)

1st AlternativeNiveau

Niveauthe literal text Niveau (case sensitive)

2nd Alternativestime

stimethe literal text stime (case sensitive)

Group 1(.*$)

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

$end of line

Group 2([\s\S]*?)

Character Class[\s\S]*?

*?matches any number of characters from the set below:

\sany whitespace character

\Sany non-whitespace character

Group 3(\1\s*)

\1the text saved by group 1

\s*any whitespace character, 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

Search reference

Regular Expression

^(?!(?:\s*$|.*(?:Niveau|stime)))(.*$)([\s\S]*?)(\1\s*)

New

vide vide Time: stime 3:30 PM vide vide  
NN NN NP stime LS NP NN NN  
 ----------Niveau 1--------------  
Time: | 0 | 263.0 | 266.0 | 0,0113  
NP | 0 | 0.0 | 24885.0 | 1  
3:30 | -0 | 104.0 | 120.0 | 0,1333  
LS | -0 | 0.0 | 13134.0 | 1  
PM | -1 | 134.0 | 238.0 | 0,437  
NP | -1 | 0.0 | 24885.0 | 1  
 ----------Niveau 2--------------  
3:30 PM | -0 | 30.0 | 41.0 | 0,2683  
3:30 NP | -0 | 133.0 | 55.0 | -1,4182  
LS PM | -0 | 42.0 | 237.0 | 0,8228  
LS NP | -0 | 0.0 | 2456.0 | 1  
 ----------Niveau 3--------------  


vide vide Time: stime 3:30 pm vide vide   
NN NN NP stime LS NN NN NN   
 ----------Niveau 1--------------  
Time: | 0 | 263.0 | 266.0 | 0,0113  
NP | 0 | 0.0 | 24885.0 | 1  
3:30 | -0 | 104.0 | 120.0 | 0,1333  
LS | -0 | 0.0 | 13134.0 | 1  
pm | -1 | 38.0 | 54.0 | 0,2963  
NN | -1 | 0.0 | 59511.0 | 1  
 ----------Niveau 2--------------  
3:30 pm | -0 | 9.0 | 9.0 | 0  
3:30 NN | -0 | 36.0 | 24.0 | -0,5  
LS pm | -0 | 22.0 | 52.0 | 0,5769  
LS NN | -0 | 0.0 | 2658.0 | 1  
 ----------Niveau 3--------------

Regular Expressions 101

Regular Expression

Extraction