So, if your use-case allows it, you should prefer the repeated substitution method. Returns a string with all substrings that match the regular expression consecutively being replaced. This solution is faster than combining the patterns into a single regex (by a factor of 100). If you reverse the rule order, this example would also return "bc". Also, note that the order of rules matters. in your pattern ( - should be last however, otherwise in will be recognized as range). In my case I wanted to rebuild the sed behavior. First you don't have to escape characters inside. Depending on your use case you may or may not want to replace strings consecutively. With the same input and rules, the other solutions will output "bc". Other Python RegEx replace methods are sub () and subn () which are used to replace matching strings in re Python Flags Many Python Regex Methods and Regex functions take an optional argument called Flags This flags can modify the meaning of the given Regex pattern Various Python flags used in Regex Methods are re.M, re.I, re.S, etc. However, the following function returns the same output as a call to unix sed would: def multi_replace(rules, data: str) -> str: To construct a regular expression, you need to escape any backslashes by preceding each of them with a backslash ( \ ): pattern '\\section' Code language: JavaScript (javascript) In regular expressions, the pattern must be '\\section'. Namely, repeated substitutions may evolve the text over time. In Python, the backslash ( \) is a special character. That being said, the output of this approach is different than the output of the combined regex approach. This answer is just for the sake of completeness. I dont know why most of the solutions try to compose a single regex pattern instead of replacing multiple times. While i > ReplWrapper(REPL_DICT).multiple_replace(s) # Use 'i' as the index within 'all_groups' and 'j' as the main Return next(islice(self.repl_ems(), pos, pos 1)) So in your case, you could make a dict trans = )' for pattern in repl_dict) The first is the string that you want to replace, and the second is the replacement. replace () onto any string and provide the method with two arguments. replace () string method: > 'Fake Python'.replace('Fake', 'Real') 'Real Python' As you can see, you can chain. "creator" : "Benevolent Dictator for Life", The most basic way to replace a string in Python is to use the. Text = "Larry Wall is the creator of Perl" # For each match, look-up corresponding value in dictionary # Create a regular expression from the dictionary keys In fact, that's how the Python Cookbook does it, as shown in this example (copied from ActiveState ) import re The answer proposed by is valid, but I would argue less pythonic than the canonical example, which uses code less opaque than his regex manipulations and takes advantage of python's built-in data structures and anonymous function feature.Ī dictionary of translations makes sense in this context.
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