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Three commonly-used technologies in translator development are CSS Selectors, XPath, and Regex. Resources for learning these technologies are linked to below:
CSS Selectors
A comprehensive and accessible resource is available from W3Schools: https://www.w3schools.com/cssref/css_selectors.asp
The Mozilla Development Network (MDN) also provides a CSS Selector resource: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Selectors
XPath
A tutorial is available from Liquid Technologies: https://www.liquid-technologies.com/xpath-tutorial
Regex
There are many high-quality regex tutorials available online. A comprehensive guide is provided all in one page at: https://github.com/zeeshanu/learn-regex/blob/master/README.md
Regex 101 also provides a useful platform for testing regex structures: http://regex101.com/