Regex Replace Python

Question

In my project I need to be able to replace a regex in a string to another.

For example if I have 2 regular expressions [a-c] and [x-z], I need to be able to replace the string "abc" with "xyz", or the string "hello adan" with "hello xdxn". How would I do this?

You want to replace the regex in the string, or you want to *use* the regex to replace a substring in the string? Can you give some examples? — xdhmoore, Sep 30 '20 at 22:28
Does this answer your question? https://stackoverflow.com/questions/555705/character-translation-using-python-like-the-tr-command — xdhmoore, Sep 30 '20 at 22:43
This is what I propose although I use only base python functionalities. — polkas, Sep 30 '20 at 22:54

Alejandro Kaspar · Answer 1 · 2020-09-30T22:57:37.547

0

Try with re.sub

>>>replace = re.sub(r'[a-c]+', 'x','Hello adan')
>>>replace
'Hello xdxn'
>>>re.sub(r'[a-c]+', 'x','Hello bob')
'Hello xox'

edited Sep 30 '20 at 22:57

answered Sep 30 '20 at 22:40

Alejandro Kaspar

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3
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polkas · Accepted Answer · 2020-09-30T22:52:27.433

We build a map and then translate letter by letter. When using get for dictionary then the second argument specifying what to return if not find.

>>> trans = dict(zip(list("xyz"),list("abc")))
>>> trans
{'x': 'a', 'y': 'b', 'z': 'c'}
>>> "".join([trans.get(i,i) for i in "hello xdxn"])
'hello adan'
>>>

Or change the order in trans to go in other direction

>>> trans = dict(zip(list("abc"),list("xyz")))
>>> trans
{'a': 'x', 'b': 'y', 'c': 'z'}
>>> "".join([trans.get(i,i) for i in "hello adan"])
'hello xdxn'
>>>

Regex Replace Python

2 Answers2