boostorg/regex
1
0
Fork 1
mirror of https://github.com/boostorg/regex.git synced 2025-07-15 21:32:18 +02:00
Code Issues Packages Projects Releases Wiki Activity

Merge regex changes from Trunk.

Browse Source 
[SVN r76192]
This commit is contained in:
John Maddock
2011-12-26 18:28:30 +00:00
parent e0fe0863ad
commit 090520dbb4
47 changed files with 1551 additions and 1524 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
doc/introduction.qbk
View File

@ -40,14 +40,14 @@ of 16-digits, separated into groups of 4-digits, and separated by either a
space or a hyphen. Before storing a credit card number in a database
(not necessarily something your customers will appreciate!), we may want to
verify that the number is in the correct format. To match any digit we could
use the regular expression [0-9], however ranges of characters like this are
use the regular expression \[0-9\], however ranges of characters like this are
actually locale dependent. Instead we should use the POSIX standard
form \[\[:digit:\]\], or the Boost.Regex and Perl shorthand for this \\d (note
that many older libraries tended to be hard-coded to the C-locale,
consequently this was not an issue for them). That leaves us with the
following regular expression to validate credit card number formats:
[pre (\d{4}[- ]){3}\d{4}]
[pre (\d{4}\[- \]){3}\d{4}]
Here the parenthesis act to group (and mark for future reference)
sub-expressions, and the {4} means "repeat exactly 4 times". This is an