delete all lines that start with specific litter

[Fahad Alotaibi]

hi, i have a HUGE txt file that have more than 100,000,00 lines.
i want to delete any line that start with the letter P ( the entire line not just the letter P )

[Alan Kilborn]

@Fahad-Alotaibi

Use Regular expression replacement:

Search for ^P.*\R
Replace with nothing.

[Fahad Alotaibi]

@Alan-Kilborn
Thank you, i tried it but didn’t work for me

[Alan Kilborn]

@Fahad-Alotaibi

Well, this site is about help with Notepad++.
Not sure what text editor you showed the screenshot from, but it is not Notepad++.

[Fahad Alotaibi]

@Alan-Kilborn
i know , i used what you said with notepad++ didn’t work so i tried another txt editor and still didn’t work

[Alan Kilborn]

@Fahad-Alotaibi

I probably should have been a bit more specific with my regular expression:

(?-s)^P.*\R

But really, show how it looks in Notepad++, not some other editor (that just confuses things).

[PeterJones]

@Fahad-Alotaibi said in delete all lines that start with specific litter:

I used what you said with notepad++ didn’t work

Then you did something wrong.

Before:

P123456
Q123456
P123456
P123456
M123456

Replace All
After:

Q123456
M123456

See, it deleted all the lines that started with P

If it doesn’t work for you, follow the same steps I just showed, including screeenshots.

[angel_heart]

@PeterJones thanks solved my problem too