The `extract_string` function takes an input string and uses the `re.compile` and `search` functions from the re module to find any sequence of one or more alphanumeric characters, then extracts that substring using string slicing if a match is found. ![]() This script demonstrates how to use Regular expressions in Python to extract a string until the first non-alphanumeric character. If there is no match in the input string, the function returns `None`. The function returns the extracted substring. If a match is found, the function extracts the full substring from the match start index to the match end index using string slicing. The `search` function from the `re` module is then used to find the first match in the input string. The function defines a regular expression using the `re.compile` function that matches any sequence of one or more alphanumeric characters. In this script, the function `extract_string` takes a single argument `s`, which is the input string. Print(extract_string("Hello World.")) # Output: Hello # Test the function on some input strings # If there is a match, extract the substring # Define a regular expression to match alphanumeric characters One way to extract a string until the first non-alphanumeric character in Python is to use Regular expressions. If no match is found, it returns None instead. It then uses the `search` function from the `re` module to find the first match in this string and extracts its substring if there is one. The function `extract_string` takes a single argument `s`, which is the input string, and defines a regular expression to match alphanumeric characters. ![]() This blog post provides an example script for extracting a string until the first non-alphanumeric character in Python using Regular expressions.
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