Python Unicode Regular Expression смотреть онлайн

Regular expressions (regex or regexp) are a powerful tool for pattern matching and text manipulation in Python. Unicode is a character encoding standard that supports a wide range of characters from various scripts and languages. In this tutorial, we'll explore how to use Python's re module to work with Unicode regular expressions.
In Python 3, Unicode is the default text representation, allowing you to work with characters from different scripts and languages. You can represent Unicode characters using escape sequences, like \u followed by the character's hexadecimal code point. For example, "\u03A3" represents the Greek capital letter Sigma (Σ).
The re module in Python is used for working with regular expressions. To use Unicode regular expressions, you need to set the re module's UNICODE flag when compiling your regex pattern. This flag ensures that the regular expression engine interprets patterns and input text as Unicode.
To set the UNICODE flag, use the re.compile() function:
Unicode regular expressions can match characters based on their Unicode properties. Some common properties include:
You can find a list of Unicode properties in the Unicode Character Database (UCD) documentation.
Let's create a Python program to match Unicode characters from a string.
This code uses the \p{L}+ pattern to match sequences of Unicode letters. It extracts the words from the text, including words from different languages.
You can use Unicode properties to match emojis. In this example, we'll extract emojis from a text:
This code matches and extracts emojis from the text.
You can use Unicode regular expressions to validate non-ASCII text. For instance, checking if a string contains any non-ASCII characters:
This code defines a function that checks if a string contains non-ASCII characters using a Unicode regular expression.
That's it! You've learned how to use Python's re module to work with Unicode regular expressions. You can now apply these techniques to perform powerful text processing tasks on a wide range of characters and scripts.
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