The best replacement for regular language is context free language.

The best alternatives to regular language are rated as following:
★★★★★  context free language
★★★★  non regular language
★★★  regular expression
★  formal language

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No companions for regular language have been suggested so far.
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Google Trends

Scale is based on the average worldwide traffic of regular language in all years. Click on graph for more.
regular language
context free language
non regular language