Regexp Help!

BiLL · Post by **BiLL** » Mon Jun 30, 2003 6:22 pm

Greetings,

I read the manuel of Regexp but I still don't get it,
I think its not in manual.

My problem:
This regexp

if {![regexp "^(\[0-9\].\[0-9\])" [lindex $arg 1]]} {

Input like 1.0 works -> CORRECT
Input like x1.0 doesnt work -> CORRECT
But
Input like 1.0xxx <- any other word after that 0 works also
but I want only the user be able to input 1.0 and not 1.0xxx

I tried to add the ^ to the end of the regexp "" but it doenst work that way - which would be easy ;(.
Anyone knows a solution?

Post by **user** » Mon Jun 30, 2003 8:10 pm

add a \$ to the end of your rule

ppslim · Post by **ppslim** » Tue Jul 01, 2003 4:48 am

Quick tip: Enclose your RegExp expression in curly braces rather than quotes.

This will save the requirment to excape characters, except where you need to force a escape code.

This will make the expression look neater, and save you from having 3 slashes to escape one character.

You above code would become (including fix).

Code: Select all

if {![regexp {^([0-9].[0-9])$} [lindex $arg 1]]} {

BiLL · Post by **BiLL** » Tue Jul 01, 2003 9:23 am

big thx ppslim worked fine!!

Papillon · Post by **Papillon** » Tue Jul 01, 2003 9:48 am

if you want to shorten the line you can do this:

Code: Select all

if {![regexp {^(\d.\d)$} [lindex $arg 1]]} {

Post by **user** » Tue Jul 01, 2003 10:49 am

...and escaping the "." would make it only match "digit-period-digit" which i suspect is what you want. (the current rule will match "digit-anything-digit")

BiLL · Post by **BiLL** » Tue Jul 01, 2003 11:15 am

i am using
if {![regexp {^([0-9].[0-9])$} [lindex $arg 1]]} {
right now.

how do i esacpe the "." ?
i want to enforce: digitDOTdigit
digit = 0-9

Post by **user** » Tue Jul 01, 2003 1:11 pm

Papillon · Post by **Papillon** » Tue Jul 01, 2003 2:23 pm

oops

forgot the dot...

Code: Select all

if {![regexp {^(\d\.\d)$} [lindex $arg 1]]} {

should do the trick

BiLL · Post by **BiLL** » Tue Jul 01, 2003 2:42 pm

big thanks hehe.
great forum