CODEWITHSUNDEEP
xpath
alcybery
alcybery

Reputation: 55

Use XPath 1.0 to find elements with digits and dots

I need to find elements containing only digits and dots using XPath 1.0.

For example from elements like these:

89.0.1/
89.0.2/
89.0/
89.0b1/
89.0b10/
89.0b11/
something-else/

It would only leave these:

89.0.1/
89.0.2/
89.0/

Upvotes: 0

Views: 122

Answers (2)

Eric Chow
Eric Chow

Reputation: 479

I am not sure if your package support EXSLT.

If it does, you can use regular expressions.

Add a namespace

re = http://exslt.org/regular-expressions

And use the following XPath:

s="""
<root>
    <item>89.0.1</item>
    <item>89.0.2</item>
    <item>89.0</item>
    <item>89.0b1</item>
    <item>89.0b10</item>
    <item>89.0b11</item>
    <item>something-else</item>
</root>
"""
ns = {"re": "http://exslt.org/regular-expressions"}
from lxml import etree
root = etree.XML(s)
root.xpath("item/text()[re:test(., '^[\d\.]+$')]", namespaces=ns)

Upvotes: 1

zx485
zx485

Reputation: 29022

You can match all elements that have only digits and dots (and the / char, as in your sample) with this XPath-1.0 expression:

self::*[translate(., '0123456789./','')='']

If you don't need the elements, but rather just a TRUE/FALSE condition, omit the self::*[ and ] part.

Upvotes: 2

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