如何使用XPath提取特定数值？——从文本中提取数字的实例咨询

Got it, let's figure out how to pull just the number "6" from the text "ตอนที่ 6" you've already fetched with //li[@class='active']/text(). The approach depends on which XPath version your tool/library supports—here are the most common solutions:

XPath 2.0+ (Modern Tools/Libraries) #

If you're using an XPath 2.0 or newer compatible tool (like Saxon, or modern scrapers that support it), you have flexible regex-based options:

• Strip all non-digit characters with replace():

  replace(//li[@class='active']/text(), '[^\d]', '')
  

  This regex replaces every character that isn't a digit ([^\d]) with an empty string, leaving only the number behind.

• Split the string and grab the last segment with tokenize():
  Since the number is at the end of the string separated by a space, you can split on whitespace and pick the last item:

  tokenize(//li[@class='active']/text(), '\s+')[last()]
  

  \s+ matches one or more whitespace characters, so even if there are multiple spaces, this will still work.

XPath 1.0 (Older Tools/Libraries) #

XPath 1.0 doesn't support regex or string splitting, but we can use basic string functions since your target text has a consistent format:

• Use substring-after() to get text after the space:

  substring-after(//li[@class='active']/text(), ' ')
  

  This works because the number comes right after a single space in "ตอนที่ 6".

• Handle potential extra spaces with normalize-space():
  If there's a chance of multiple spaces between "ตอนที่" and the number, normalize the whitespace first:

  substring-after(normalize-space(//li[@class='active']/text()), ' ')
  

  normalize-space() collapses multiple spaces into one, trims leading/trailing spaces, so the substring-after will reliably find the number.

All these methods will give you either "6" (or " 6 " if there are trailing spaces, but normalize-space() can fix that too if needed!).

内容的提问来源于stack exchange，提问作者parames3010