![]() If you want to use the same regexp more than once in a script, it might be a good idea to use a regular expression object, i.e. We will demonstrate how to formulate alternations of substrings in this chapter of our tutorial, So far, we only know how to define a choice of characters with a character class. A task which needs programming in other programming languages like Perl or Java, but can be dealt with the call of one method of the re module of Python. how to find all the matched substrings of a regular expression. ![]() We will also explain further methods of the Python module re. In this chapter we will continue with our explanations about the syntax of the regular expressions. The introduction ended with a comprehensive example in Python. You must also be familiar with the use of grouping and the syntax and usage of back references.įurthermore, we had explained the match objects of the re module and the information they contain and how to retrieve this information by using the methods span(), start(), end(), and group(). We have also introduced the quantifiers to repeat characters and groups arbitrarily or in certain ranges. You must know the special meaning of the question mark to make items optional. ![]() You must have learnt how to match the beginning and the end of a string with a regular expression. The concept of formulating and using character classes should be well known by now, as well as the predefined character classes like \d, \D, \s, \S, and so on. We have also learnt, how to use regular expressions in Python by using the search() and the match() methods of the re module. ![]() We have shown, how the simplest regular expression looks like. In our introduction to regular expressions of our tutorial we have covered the basic principles of regular expressions. ![]()
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