Bare Bones Software : PRODUCTS : TEXTWRANGLER
I've posted on this long ago. TextWranger is the free version of BBEdit. The free version is one of the best text editors in existence on any platform. My comment here, however, is not about the software. I happened today to glance at the manual. The section on GREP is an impressive tutorial on pattern matching and grep. I'm sending a copy of the manual to my office as a reference for Grep use (on my PC I use TextPad's GREP, which is pretty good - but no match for TextWrangler!).