Python regular expression: Matching text between two strings

├Źndice
  1. Introduction
  2. Using re.search()
  3. Using re.findall()
  4. Conclusion

Introduction

When working with text in Python, regular expressions can be a powerful tool. One common task is to find text that occurs between two specific strings. In this article, we'll explore how to use regular expressions to match text between two strings in Python.

Using re.search()

The re module in Python provides a search() function that can be used to search for a pattern within a string. We can use this function to find text between two strings by constructing a regular expression that matches the start and end strings, and captures the text in between.

Here's an example:

import re

text = "The quick brown fox jumps over the lazy dog"
start = "quick"
end = "lazy"

pattern = re.compile(start + "(.*)" + end)
result = pattern.search(text)

if result:
    print(result.group(1))

In this example, we create a regular expression pattern that matches the start string ("quick"), followed by any number of characters (captured using the (.*) group), followed by the end string ("lazy"). We then use the search() function to find a match within the text.

If a match is found, we print the text captured by the (.*) group using the group() method.

Using re.findall()

Another option is to use the findall() function in the re module. This function returns a list of all non-overlapping matches in the string.

Here's an example:

import re

text = "The quick brown fox jumps over the lazy dog"
start = "quick"
end = "lazy"

pattern = re.compile(start + "(.*)" + end)
result = pattern.findall(text)

for match in result:
    print(match)

In this example, we use the same regular expression pattern as before, but instead of using search(), we use findall() to find all matches of the pattern in the text. We then loop through the matches and print each one.

Conclusion

Regular expressions can be a powerful tool for working with text in Python. By using the search() or findall() functions in the re module, we can easily find text that occurs between two specific strings.

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