Question

Is it possible to create a regular expression that matches a comparison such as less than or greater than? For example, match all dollar values less than $500.

One way I would use this would be on online stores that list many products on a single page but do not provide a way to sort by price. I found a search page by regex extension for Chrome and am trying to figure out if there is a way I can use a regex to match any strings on the page beginning with a dollar sign followed by any number less than a number that I specify.

Answer 1

This should work for you \$[1-4]?\d?\d\b.

Explanation:

r"""
\$       # Match the character “$” literally
[1-4]    # Match a single character in the range between “1” and “4”
   ?        # Between zero and one times, as many times as possible, giving back as needed (greedy)
\d       # Match a single digit 0..9
   ?        # Between zero and one times, as many times as possible, giving back as needed (greedy)
\d       # Match a single digit 0..9
\b       # Assert position at a word boundary
"""