{"id":3143,"date":"2021-11-29T11:07:10","date_gmt":"2021-11-29T11:07:10","guid":{"rendered":"https:\/\/www.pythontutorial.net\/?page_id=3143"},"modified":"2023-06-01T01:24:13","modified_gmt":"2023-06-01T01:24:13","slug":"python-regex-word-boundary","status":"publish","type":"page","link":"https:\/\/www.pythontutorial.net\/python-regex\/python-regex-word-boundary\/","title":{"rendered":"Python Regex Word Boundary"},"content":{"rendered":"\n

Summary<\/strong>: in this tutorial, you’ll learn how to construct regular expressions that match word boundary positions in a string.<\/p>\n\n\n\n

Introduction to the Python regex word boundary #<\/a><\/h2>\n\n\n\n

A string has the following positions that qualify as word boundaries:<\/p>\n\n\n\n

    \n
  1. Before the first character in the string if the first character is a word character (\\w<\/code>).<\/li>\n\n\n\n
  2. Between two characters in the string if the first character is a word character (\\w<\/code>) and the other is not (\\W<\/code> – inverse character set of the word character \\w<\/code>).<\/li>\n\n\n\n
  3. After the last character in a string if the last character is the word character (\\w<\/code>)<\/li>\n<\/ol>\n\n\n\n

    The following picture shows the word boundary positions in the string \"PYTHON 3!\"<\/code>:<\/p>\n\n\n\n

    \"python<\/figure>\n\n\n\n

    In this example, the \"PYTHON 3!\"<\/code> string has four word boundary positions:<\/p>\n\n\n\n