Add ERB lexer#1228
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alecthomas
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Mar 13, 2026
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This PR adds support for embedded Ruby (ERB) which is commonly used in Ruby on Rails projects. Note that I used heavy assistance from Claude Code and tried to ensure it didn't generate slop to the best of my abilities. All tests are passing and I also visually verified the end result which looks solid to me.
Here's a screenshot that was generated by building the Chroma CLI with the ERB lexer and running it against the test data file with
chroma --lexer=erb --style=monokai --html lexers/testdata/erb.actual