XPath Text Inclusion Functions: Precise Positioning of Element Expressions

Fuzzy Search" in XPath

Engaged in web crawling brother understand, the most headache is the element positioning like a needle in a haystack. At this timecontains() functionIt's like a night vision device that can directly target elements with specific text. For example, to find all the buttons on a page with the words "Buy Now", write a//button[contains(text(),'Buy Now')]It's done.

But there is a pitfall here - many websites are now engaged in dynamic loading, page elements change around. This time you have to rely on proxy IP toBypassing Access Frequency RestrictionsThe following is an example of a rotating IP pool. As a chestnut, with ipipgo's rotating IP pool, each request for a different IP address, with accurate XPath positioning, both to save traffic and not easy to trigger the anti-climbing mechanism.

How proxy IPs work with XPath

We often encounter this situation in practice:
1. Incomplete loading of the target site, with sporadic elements
2. Captcha pop-up interruption process
3. Randomized changes in page structure to play a rogue

That's when it's time toDouble Insurance Strategy::
- Fuzzy matching with contains()
- Simulating real-life operations with ipipgo's residential agent
This combination of punches can increase the success rate by more than 60%. For example, when collecting e-commerce prices, use//span[contains(@class,'price')]to cope with price tag naming differences from site to site.

Practical cases of hands-on teaching

Suppose we want to capture the speech of the owner of a forum (characteristic: user level with the "moderator" logo):

//div[contains(@class,'user-info') and contains(. ,'moderator')]/following-sibling::div[@class='content']

At this point, if you directly use your own IP to swipe wildly, you will be blocked in minutes. Use ipipgo's solution:

Frequently Asked Questions QA

Q: Why do I have to proxy IPs with contains()?
A: Accurate positioning to reduce the number of requests, proxy IP to prevent the request is too dense to be blocked, this is double protection.

Q: What should I do if I encounter a dynamic class?
A: For example//div[contains(@class,'price_')]Match elements whose class contains price_, and also remember to use ipipgo's residential proxy, not the data center IP.

Q: What's the scoop on ipipgo?
A: Their homeon-demand billing modelEspecially suitable for small and medium-sized projects, unlike other companies have to be a monthly subscription. There is also real-time monitoring of IP availability, which IP hangs automatically cut, this point is especially critical in the long-term collection.

A guide to avoiding the pitfalls to remember

Three final words of advice for newbies:
1. Don't use too short a word in contains, it's easy to mis-match.
2. Proxy IPs should be chosen with automatic verification (e.g. ipipgo's quality check function)
3. Important data collection remember to do local caching to prevent repeated requests

In the end, XPath and IP proxy are like chopsticks brothers, which can't be used alone. Contains () play smooth, and then with a reliable ipipgo proxy service, the data collection thing will be a half of the success. What do not understand you can go directly to their home document library to turn over the case, than those outdated tutorials on the Internet much stronger.