How to replace the complete word abc.def at start, middle and end of string but do not replace the text like abc.def.au or d.abc.def:
如何在字符串的开头、中间和结尾替换完整的单词abc.def，但不能像abc.def.au或d.b c odef这样替换文本:
line = "abc.def abc.def.au abc.def d.abc.def abc.def"
new_line = re.sub("abc.def", "-----", line)
print(line)
print(new_line)
Current output:
电流输出:
abc.def abc.def.au abc.def d.abc.def abc.def
----- -----.au ----- d.----- -----
Expected output:
预期的输出:
abc.def abc.def.au abc.def d.abc.def abc.def
----- abc.def.au ----- d.abc.def -----
Can this be done in one re.sub()?
这个可以在一个re.sub()中完成吗?
1 个解决方案
#1
3
You can use line anchors. ^ and $ matches only a the start of the string and end of the string respectively, so you could use them like such:
你可以使用线锚。^和$只匹配字符串的开始和结束的字符串分别,所以你可以使用它们就像这样:
line = "abc.def abc.def.au abc.def d.abc.def abc.def"
new_line = re.sub(r"^abc\.def|abc\.def$", "-----", line)
print(line)
print(new_line)
Note that it is safer to raw regex strings, and escape the . character (which matches almost any character in regex).
注意，原始regex字符串更安全，可以转义。字符(几乎匹配regex中的任何字符)。
If you want to replace only whole words you will need some lookarounds instead:
如果你想只替换整句话，你需要找几个替代词:
line = "abc.def abc.def.au abc.def d.abc.def abc.def"
new_line = re.sub(r"(?<!\S)abc\.def(?!\S)", "-----", line)
print(line)
print(new_line)
ideone演示
(?<!\S) will prevent a match if abc.def is preceded by a non-space character.
(?
(?!\S) will prevent a match if abc.def is followed by a non-space character.
如果abc.def后面跟着一个非空格字符，则会阻止匹配。
#1
3
You can use line anchors. ^ and $ matches only a the start of the string and end of the string respectively, so you could use them like such:
你可以使用线锚。^和$只匹配字符串的开始和结束的字符串分别,所以你可以使用它们就像这样:
line = "abc.def abc.def.au abc.def d.abc.def abc.def"
new_line = re.sub(r"^abc\.def|abc\.def$", "-----", line)
print(line)
print(new_line)
Note that it is safer to raw regex strings, and escape the . character (which matches almost any character in regex).
注意，原始regex字符串更安全，可以转义。字符(几乎匹配regex中的任何字符)。
If you want to replace only whole words you will need some lookarounds instead:
如果你想只替换整句话，你需要找几个替代词:
line = "abc.def abc.def.au abc.def d.abc.def abc.def"
new_line = re.sub(r"(?<!\S)abc\.def(?!\S)", "-----", line)
print(line)
print(new_line)
ideone演示
(?<!\S) will prevent a match if abc.def is preceded by a non-space character.
(?
(?!\S) will prevent a match if abc.def is followed by a non-space character.
如果abc.def后面跟着一个非空格字符，则会阻止匹配。