oro regular expression

[Robert Mark Bram]

Hi All,

I want an expression that will allow a decimal number or a specific
string. For example, I want the following to be valid:

..1
1
1.1
-.1
-1
-1.1
remove
REMOVE
REmove

Here is the regular expression I am testing:
-{0,1}\d{0,5}(\.(\d){0,2})?|(?i)REMOVE
It accepts the numbers, but not the strings.

If I use this:
-{0,1}\d{1,5}(\.(\d){0,2})?|(?i)REMOVE
it accepts the string and most numbers, but not this:
..1

I am testing with this demo applet:
http://jakarta.apache.org/oro/demo.html

Can anyone figure what I am doing wrong? Any help would be most
appreciated!

Rob

 

[Robert Mark Bram]

I have a solution, but I don't understand why it works:
(?i)REMOVE|(-?\d{0,5}(\.)?\d{0,2})

This now accepts all the combinations I wanted, but I don't understand
why....

 

[Robert Mark Bram]

*sigh*

Actually, that 'solution' doesn't work for 1, 11 etc. mm..

 

[Oliver Wong]

Hi All,

I want an expression that will allow a decimal number or a specific
string. For example, I want the following to be valid:

.1
1
1.1
-.1
-1
-1.1
remove
REMOVE
REmove

Here is the regular expression I am testing:
-{0,1}\d{0,5}(\.(\d){0,2})?|(?i)REMOVE
It accepts the numbers, but not the strings.

If I use this:
-{0,1}\d{1,5}(\.(\d){0,2})?|(?i)REMOVE
it accepts the string and most numbers, but not this:
.1

Draw a DFA and convert it to an RE. Read Michael Sipser's book
"Introduction to the Theory of Computation" if you don't know how. I'd do it
for you, but it's a lot of effort, and you wouldn't understand how I got to
my result unless you knew Sipser's method. =/

- Oliver

 

[Alan Krueger]

Here is the regular expression I am testing:
-{0,1}\d{0,5}(\.(\d){0,2})?|(?i)REMOVE
It accepts the numbers, but not the strings. [...]
I am testing with this demo applet:
http://jakarta.apache.org/oro/demo.html

Curiously, it appears to work with java.util.Pattern.

http://www.cis.upenn.edu/~matuszek/General/RegexTester/regex-tester.html