Welcome, Guest
Username: Password: Remember me
Forgot your password? Forgot your username? Create an account
Forum
Developper center
Regular expressions
NUMBER RANGES - No leading Zero
  • Page:
  • 1

TOPIC:

NUMBER RANGES - No leading Zero 25 Sep 2012 15:03 #3977

  • JoomGuy
  • JoomGuy's Avatar Topic Author
  • Offline
  • Moderator
  • Moderator
  • Joomla Enthusiast, Lover of Cooking
  • Posts: 1115
  • Thank you received: 195
Range: 1-200 - suggested handler intrange1to200
^([1-9]|[1-9][0-9]|[1][0-9][0-9]|20[0-0])$
Range: 1-100 - suggested handler intrange1to100
^([1-9]|[1-9][0-9]|100)$
Need help with your Cook/Joomla Project? . PM me to find out what I can help with. NO time wasters please!!!

Please Log in or Create an account to join the conversation.

Re: NUMBER RANGES - No leading Zero 09 Nov 2012 15:22 #5172

  • g1smd
  • g1smd's Avatar
  • Offline
  • Junior Member
  • Junior Member
  • RegEx fiend!
  • Posts: 31
  • Thank you received: 26 
^([1-9]|[1-9][0-9]|[1][0-9][0-9]|20[0-0])$
[1] simplifies to 1 - you only need a character group if there's more than one character.

[0-0] might crash the RegEx parser. This simplifies to '0'.

[0-9] can usually be expressed as \d if your RegEx is allowed in PCRE format, and this aids readability, a [x-y] group being used only when it is not the full 0 to 9 range. If you can only use POSIX, you'll have to stick to [0-9] notation.


Try:
^([1-9]|[1-9]\d|1\d\d|200)$
However, the part [1-9]|[1-9]\d is "1 to 9 OR 1 to 9 plus a digit"

"10 to 99" is just "1 to 9 plus another digit".

The expression can be compressed, i.e. "1 to 9 plus optional digit": [1-9]\d?


So, 1 to 200 is:
^([1-9]\d?|1\d\d|200)$
( 1 to 9 and 10 to 99 | 100 to 199 | 200 )

Often the problem that needs to be solved can be defined in a different way leading to a much simpler pattern. :)


Oh, and 1 to 100 is:
^([1-9]\d?|100)$
( 1 to 9 and 10 to 99 | 100 )
Online since 1996.
The following user(s) said Thank You: JoomGuy

Please Log in or Create an account to join the conversation.

Last edit: by g1smd. Reason: Add note about PCRE and POSIX.
  • Page:
  • 1
Forum
Developper center
Regular expressions
NUMBER RANGES - No leading Zero
Time to create page: 0.304 seconds
“
”

For starters it's just so easy to design an app in a way that I'm used to i.e. database first then views followed by customization. The fork system is pure brilliance from a developer standpoint as I can override things and still add and update my projects with minimal effort! Truly amazing to be able to build components in Joomla using incremental refinement without having to do everything by hand. Thanks for the great tool! I am so much more productive now than ever and I can't imagine building components any other way!!!!
Dave (Forum)

Get Started

Log In Sign In