• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Ron McLeod
  • Paul Clapham
  • Liutauras Vilda
Sheriffs:
  • paul wheaton
  • Rob Spoor
  • Devaka Cooray
Saloon Keepers:
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Frits Walraven
  • Tim Moores
Bartenders:
  • Mikalai Zaikin

named character classes in grep

 
Ranch Hand
Posts: 136
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
I want to know how to use named charactes classes with grep command?
 
Saloon Keeper
Posts: 27762
196
Android Eclipse IDE Tomcat Server Redhat Java Linux
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Character-class pattern for USA format date string (MM/DD/YYYY):

[:digit:][:digit:]/[:digit][:digit:]/[:digit:]{4}

Which is equivalent to

\d\d/\d\d/\d{4}

Or \d{2}/\d{2}\/d{4}

Except that character classes may be more locale-sensitive, if I understood them correctly.

Another benefit of the named classes is that backslashes can bite.
[ April 18, 2008: Message edited by: Tim Holloway ]
 
Minal Silimkar-Urankar
Ranch Hand
Posts: 136
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
How can I use the named character constants with grep command?
 
reply
    Bookmark Topic Watch Topic
  • New Topic