regexp

These examples can be typed as written into the prompts of query-replace-regexp. For coding these into elisp strings, you need to escape the backslashes: \ -> \\.

• Find all occurances of $…$ and replace with \eqn{…} in R comments

[ ][$]\([^$]*\)[$]
 \\eqn{\1}

• Find all attr(…,"source") and replace with getSource(…) in R code

attr(\([a-z]+\), ?"source")
getSource(\1)

• Find all spaces before something and replace them with a comma (useful for converting space-delimited text to csv). Could also use lookahead.

[ ]\([^ ]\)
\1