jashkenas/coffee-script — comment on commit 3fb064f274875b84cc7636f33cb7ee24868f3c31
File: src/lexer.coffee line 159
By geraldalewis:

@michaelficarra One of the issues with the original regex is that the `OctalEscapeSequence` can appear anywhere within the string, and that it can be only a single char in length (after the `\` escape). [example](http://jashkenas.github.com/coffee-script/#try:'use%20strict'%0Astring%20%3D%20'%5C1'%0A)