How do I deal with special characters like \^$.?*|+()[{ in my regex?

rr-faqregex
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Filter data.frame rows by a logical condition

rr-faqdataframesubset
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Count number of rows within each group

rr-faqdataframeaggregate
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How to add leading zeros?

rr-faqformattingnumber-formatting
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Plotting two variables as lines using ggplot2 on the same graph

rr-faqggplot2graphtime-series
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