How Can I Use Regex to Replace Tags with Angle Brackets and Numbers in Python's `str.replace()`?

Regex Replacement in String.replace()

In string substitution using str.replace(), you can specify custom regular expressions as the pattern to match. In your case, you need to replace tags with angle brackets and numbers.

To do this, you can use the following code:

import re

line = re.sub(r"<\[\d+>", "", line)

Let's break down the regex:

• <: Matches a literal < character.
• [d >: Matches a [ followed by one or more digits and ].
• r prefix: Indicates the pattern is a raw string, preventing escape sequences from being interpreted.
• re.sub() replaces all occurrences of the pattern with the empty string.

Alternatively, you can use a more explanatory regex with free-spacing mode:

line = re.sub(r"""
  (?x) # Use free-spacing mode.
  <    # Match a literal '<'
  /?   # Optionally match a '/'
  \[   # Match a literal '['
  \d+  # Match one or more digits
  >    # Match a literal '>'
  """, "", line)

This version explicitly specifies the different parts of the pattern, making it easier to understand.

By using regex substitution, you can easily replace these unwanted tags without hard-coding specific values or repeating the replacement for each tag.

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