Case-insensitive XPath Contains

In XPath, the contains() function checks if one string contains another, like this:

/html/body//text()[contains(.,'test')]

This is case-sensitive, meaning it won't match "Test," "TEST," or "TesT." To enable case-insensitivity, try this workaround:

/html/body//text()[
    contains(
        translate(., 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz'),
        'test'
    )
]

This replaces every uppercase letter with its lowercase counterpart before checking for matches. However, it's limited to known character sets.

An alternative method leverages JavaScript:

function xpathPrepare(xpath, searchString) {
    return xpath
        .replace("$u", searchString.toUpperCase())
        .replace("$l", searchString.toLowerCase())
        .replace("$s", searchString.toLowerCase());
}

xp = xpathPrepare("//text()[contains(translate(., '$u', '$l'), '$s')]", "Test");

This allows for case-insensitive matching of any search string without prior knowledge of the alphabet. However, both options struggle with single quotes in search strings.