How to delete a textline with matched text in QPlainTextEdit?

Question

Below lines are in A QPlainTextEdit:

I want to delete a matched line with line variable help. For example, I want to delete

line 2 s44 grade

with the help of line variable(line = "line 2")

I am able to delete the particular text with below code:

item = "line 2"
text = self.project_length_lanes_plainedit.toPlainText()
text = text.replace(item, '')
_list = text.split()
text = '\n'.join(_list)
self.project_length_lanes_plainedit.setPlainText(text)

but I want to delete the entire line. How can I do that?

konserw · Answer 1 · 2021-03-12T17:37:03.723

0

you have 2 basic options:

use regexp to match whole line in your replace, then splitting lines is not necessary
split to list first and remove matching line from list, and in the end join list as you did

EDIT:

import re

x = """
line1: abc
line2: def
line3: ghi
"""

print("regex:")
print(re.sub(r'line2.*', '', x))  # note: this leaves empty line
print("regex2:")
print(re.sub(r'line2.*\n', '', x))

print("list:")
print('\n'.join([line for line in x.split('\n') if "line2" not in line]))

edited Mar 12 '21 at 17:37

answered Mar 12 '21 at 17:13

konserw

494
2
10

Do you mean re ?Can you give me any Example. – user3030327 Mar 12 '21 at 17:21

score 0 · Accepted Answer · answered Mar 12 '21 at 18:01

I tried as below working:

    item = "line 2"
    text = self.project_length_lanes_plainedit.toPlainText()
    for l in text.split('\n'):
        if item in l:
            text = text.replace(l, '')
            _list = text.split('\n')
            _list = [ i for i in _list if i ]
            text = '\n'.join(_list)
            self.project_length_lanes_plainedit.setPlainText(text)

How to delete a textline with matched text in QPlainTextEdit?

2 Answers2