![]() How to Use replace() to Find and Replace Patterns in Python Strings In the next section, we'll learn how to find and replace patterns in strings. ValueError Traceback (most recent call last) If we search for a substring that's not present in our string, the index() method raises a ValueError. In this case, the output is identical to that of the find() method. Let's use the string my_string = "I enjoy coding in Python!" from our previous example. However, it raises a ValueError if this_pattern is not found in this_string.If this_pattern is present in this_string, the index() method returns the starting index of the first occurrence of this_pattern.The index() method's working is very similar to that of the find() method. The method call takes the syntax shown below.index() To search for an occurrence of a pattern in a string, we might as well use the index() method. How to Use index() to Search for Patterns in Python Strings It's only over a slice of the string specified by start_index:end_index. The only difference is that the search for the pattern is not over the entire string. This works very similarly to the previously discussed syntax. In this case, the find() method call takes the following form. We can also use the find() method to search for a pattern in a certain substring or slice of a string, instead of the whole string. How to Use find() to Search for Patterns in Python Substrings The find() method has returned -1, as discussed earlier. In this example, we tried searching for "JavaScript" that isn't present in our string. ▶ Now, we'll try searching for a substring that's not present in our string. To verify if the returned index is correct, we can check if my_string="P" evaluates to True. The find() method returned 18, the starting index of the pattern "Python". In the above example, we tried searching for "Python" in "my_string". ![]() Let's take an example string "I enjoy coding in Python!". ![]()
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