Skip to content

Added a note about whitespace to heregex recipe #13

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
Jun 13, 2011
Merged

Added a note about whitespace to heregex recipe #13

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
9 changes: 9 additions & 0 deletions chapters/regular_expressions/heregexes.textile
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -25,3 +25,12 @@ pattern = ///
h2. Discussion

Breaking up your complex regular expressions and commenting key sections makes them a lot more decipherable and maintainable. For example, changing this regex to allow an optional space between the prefix and line number would now be fairly obvious.

h3. Whitespace characters in heregexes

Whitespace is ignored in heregexes -- so what do you do if you need to match a
literal ASCII space?

One solution is to use the @\s@ character class, which will match spaces, tabs
and line breaks. If you only want to match a space, though, you'll need to use
@\x20@ to denote a literal ASCII space.