How Can I Remove `` Tags from a String Using Regular Expressions in Python?

Regex Replacement with Literals and Dynamic Matching

The task at hand involves removing specific tags from a string using regular expressions. The pattern in question includes tags of the form <[n]> where n is a number between 1 and 99.

Regex Construction

To extract the required pattern using Python's re.sub, a regular expression is needed that matches these tags. The pattern should consist of a pair of angle brackets, an optional forward slash, a square bracket, a number (which varies dynamically), and a greater-than sign.

Solution

import re

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

Explanation

• r"</?[d >": This regular expression represents the pattern to be matched. It uses the following components:

  • <?: Matches an optional forward slash (/).
  • [ and ]: Delimit the square bracket.
  • d : Matches one or more digits, ensuring flexibility for any number within the <[n]> tags.
  • >: Matches the closing greater-than sign.
• "": An empty string replaces the matched tags, effectively removing them.

Using re.sub, this pattern identifies and replaces all occurrences of the specified tags within the input string. This solution elegantly handles the variations in numbers without relying on hard-coded replacements.

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