Python - Word Replacement

Replacing the complete string or a part of string is a very frequent requirement in text processing. The replace() method returns a copy of the string in which the occurrences of old have been replaced with new, optionally restricting the number of replacements to max.

Following is the syntax for replace() method −

str.replace(old, new[, max])

Parameters

  • old − This is old substring to be replaced.

  • new − This is new substring, which would replace old substring.

  • max − If this optional argument max is given, only the first count occurrences are replaced.

This method returns a copy of the string with all occurrences of substring old replaced by new. If the optional argument max is given, only the first count occurrences are replaced.

Example

The following example shows the usage of replace() method.

str = "this is string example....wow!!! this is really string"
print (str.replace("is", "was"))
print (str.replace("is", "was", 3))

Result

When we run above program, it produces the following result −

thwas was string example....wow!!! thwas was really string
thwas was string example....wow!!! thwas is really string

Replacement Ignoring Case

import re
sourceline  = re.compile("Tutor", re.IGNORECASE)
 
Replacedline  = sourceline.sub("Tutor","Tutorialspoint has the best tutorials for learning.")
print (Replacedline)

When we run the above program, we get the following output −

Tutorialspoint has the best Tutorials for learning.
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