I have a problem with a regex, i should delete the NOP line only when the previous line starting with #/ and ends with the letter E

SFIFIPII2#/TEST/APPTEST1/KJOBA01
 FOLLOWS KTEST1

SFIFIPII2#/TEST3/APPTEST12/KJOBA03E
 NOP
 FOLLOWS KTEST14D
 
SFIFIPII4#/TEST5/APPTEST3/KJOBA04
 NOP
 FOLLOWS KTEST15

SFIFIPII23#/TEST2/APPTEST13/KJOBA018
 FOLLOWS KTEST15

SFIFIPII26#/TEST7/APPTEST18/KJOBA01AE
 AT 0600 
 NOP
 FOLLOWS KTEST1B
 
SFIFIPII23#/TEST2/APPTEST11/KJOBA01C
 AT 0600 
 NOP
 FOLLOWS KTEST1S

SFIFIPII2A#/TESTD/APPTEST1F/KJOBA01D
 FOLLOWS KTEST1S

SFIFIPII2N#/TEST/APPTEST1V/KJOBTESTE
 AT 0600 
 NOP
 FOLLOWS KTEST11
 FOLLOWS KTEST12
 FOLLOWS KTEST11

SFIFIPII2#/TEST/APPTEST1/KJOBA01LS
NEEDS 1 MANAGER_XA#RA0E2AB
 FOLLOWS KTEST12

SFIFIPII2#/TEST3/APPTEST12/KJOBA08E
 NOP
 FOLLOWS KTEST14D

with this regex i was able to locate the line starting with #/ and ending with letter E

^.*#\/.*E$

in this example the result is:

SFIFIPII2#/TEST3/APPTEST12/KJOBA03E

SFIFIPII26#/TEST7/APPTEST18/KJOBA01AE

SFIFIPII2N#/TEST/APPTEST1V/KJOBTESTE

SFIFIPII2#/TEST3/APPTEST12/KJOBA08E

however i don't know how to delete its corresponding NOP line:

there are two cases, one with the NOP line immediately after it, the second case is that NOP line it is found two lines after.

SFIFIPII2#/TEST3/APPTEST12/KJOBA03E
 NOP
 FOLLOWS KTEST14D

SFIFIPII26#/TEST7/APPTEST18/KJOBA01AE
 AT 0600 
 NOP
 FOLLOWS KTEST1B

https://regex101.com/r/FhdPKf/1

i'm use a editor text with search and replace regex support. (textpad, editpad, pspad)

some advice, thanks.

Regards

Italo

CodePudding user response：

You could use a capture group to keep what you want after the replacement, and match the line with NOP to be removed.

In the replacement use capture group 1.

^(.*#\/.*E(?:\r?\n(?![^\S\r\n]*NOP$).*)*)\r?\n[^\S\r\n]*NOP$

• ^ Start of string
• ( Capture group 1
  • .*#\/.*E Match a line that contains #/ and ends on E
  • (?: Non capture group
    • \r?\n(?![^\S\r\n]*NOP$).* Match a newline, and the rest of the line if it does not start with optional spaces and NOP
  • )* Close group and optionally repeat to match all lines
• ) Close group 1
• \r?\n[^\S\r\n]*NOP Match a newline, optional whitespace chars without newlines and NOP
• $ End of string

See a regex demo

You might for example also make the pattern a bit more restricted to not cross matching empty lines, or lines that also contain /# and end with an E char inbetween before matching NOP:

^(.*#/.*E(?:\r?\n(?![^\S\r\n]*(?:NOP)?$|.*#/.*E$).*)*)\r?\n[^\S\r\n]*NOP$

See another regex demo