We are using below example to validate that edit control only contains numbers.
class predicates
validateNumber : control::validateResponder.
clauses
validateNumber(Control) = control::contentsOk :-
hasDomain(integer, _X),
_X = trytoTerm(Control:getText()),
!.
validateNumber(Control) = control::contentsInvalid(Control, Control,
string::format("%s must be an integer!", Control:getLabel())).
Is there example to validate if string contains only alphabets and message user if it contains numbers?
Below code adds validation for allowing only alphabets. Replaceall allows with Spaces. Thanks to Gukalov for providing answer on discuss . visual-prolog . com
class predicates
allowonlyalphabets : control::validateResponder.
clauses
allowonlyalphabets(Control) =
if string::hasAlpha(string::replaceAll(Control:getText(), " ", "")) then
control::contentsOk
else
control::contentsInvalid(Control, Control,
string::format("%s must not contain numbers!", Control:getLabel()))
end if.
Related
I have db structure like this :
"selfId": "cd29433e-f36b-1410-851b-009d805073d7",
"selfName" : "A",
"bookIds": [
"2f51bfd4",
"2f3a1010",
"090436c0",
"1078c3b2",
"b63b06e0"
]
I am working in C# and get bookId as a string.
I am writing query as :
string SQLquery = string.Format("select c.selfName from c where ARRAY_CONTAINS(c.bookIds,\""+bookId+"\"");
But When bookId contains special character, then query is giving error. For example if bookId = "AK"s" book" (please note id itself contains ") , then executing sqlQuery is giving error.
When a text contains quotes, slashes, special characters, you can use Escape Sequence
The quoted property operator [""] can also be used to access properties. for example, SELECT food.id and SELECT food["id"] are equal. This syntax can be used to escape a property with spaces, special characters, or a name that is the same as a SQL keyword or reserved term.
Example:
SELECT food["id"]
FROM food
WHERE food["foodGroup"] = "Snacks" and food["id"] = "19015"
Reference :- https://learn.microsoft.com/en-us/azure/cosmos-db/sql/sql-query-constants#bk_arguments
I am coding a python flask app and I defined a Contact field using the string field type.
I would like to validate the field to accept numbers only mobile numbers. Please guide!
contact = StringField('Contact',validators=[DataRequired(),Length(min=10, max=10)])
You can use Regular Expressions validator Regexp() like this:
contact = StringField('Contact',validators=[DataRequired(),Length(min=10, max=10),Regexp(regex='^[+-]?[0-9]$')])
^ means start of string.
$ end of string.
[-+]?means an optional + or - ( ? means optional) and [ ] is for a set of characters.
[0-9]+ the + means one or more digits.
You can find more about wtforms' Regexp() class from documentation.
I need to validate for valid code name.
So, my string can have values like below:
String test = "C000. ", "C010. ", "C020. ", "C030. ", "CA00. ","C0B0. ","C00C. "
So my function needs to validate below conditions:
It should start with C
After that next 3 characters should be numeric before .
Rest it can be anything.
So in above string values, only ["C000.", "C010.", "C020.", "C030."] are valid ones.
EDIT:
Below is the code I tried:
if (nameObject.Title.StartsWith(String.Format("^[C][0-9]{3}$",nameObject.Title)))
I'd suggest a regex, for example (written off the top of my head, may need work):
string s = "C030.";
Regex reg = new Regex("C[0-9]{3,3}\\.");
bool isMatch = reg.IsMatch(s);
This regex should do the trick:
Regex.IsMatch(input, #"C[0-9]{3}\..*")
Check out http://www.techotopia.com/index.php/Working_with_Strings_in_C_Sharp
for a quick tutorial on (among other things) individual access of string elements, so you can test each element for your criteria.
If you think your criteria may change, using regular expressions gives you maximum flexibility (but is more runtime intensive than regular string-element evaluation). In your case, it may be overkill, IMHO.
I want to find if a string contains another string in Pig. I found that there is a built-in index function, but it only searches for characters not strings.
Is there any other alternative?
You can use this :
X = FILTER A BY (f1 matches '.*the_word_you're_looking_for.*');
More information here : http://pig.apache.org/docs/r0.10.0/basic.html#comparison
I want to match a few lines for a string and a few numbers.
The lines can look like
" Code : 75.570 "
or
" ..dll : 13.559 1"
or
" ..node : 4.435 1.833 5461"
or
" ..NavRegions : 0.000 "
I want something like
local name, numberLeft, numberCenter, numberRight = line:match("regex");
But I'm very new to the string matching.
This pattern will work for every case:
%s*([%w%.]+)%s*:%s*([%d%.]+)%s*([%d%.]*)%s*([%d%.]*)
Short explanation: [] makes a set of characters (for example the decimals). The last to numbers use [set]* so an empty match is valid too. This way the number that haven't been found will effectively be assigned nil.
Note the difference between using + - * in patterns. More about patterns in the Lua reference.
This will match any combination of dots and decimals, so it might be useful to try and convert it to a number with tonumber() afterwards.
Some test code:
s={
" Code : 75.570 ",
" ..dll : 13.559 1",
" ..node : 4.435 1.833 5461",
" ..NavRegions : 0.000 "
}
for k,v in pairs(s) do
print(v:match('%s*([%w%.]+)%s*:%s*([%d%.]+)%s*([%d%.]*)%s*([%d%.]*)'))
end
Here is a starting point:
s=" ..dll : 13.559 1"
for w in s:gmatch("%S+") do
print(w)
end
You may save these words in a table instead of printing, of course. And skip the second word.
#Ihf Thank you, I now have a working solution.
local moduleInfo, name = {};
for word in line:gmatch("%S+") do
if (word~=":") then
word = word:gsub(":", "");
local number = tonumber(word);
if (number) then
moduleInfo[#moduleInfo+1] = number;
else
if (name) then
name = name.." "..word:gsub("%$", "");
else
name = word:gsub("%$", "");
end
end
end
end
#jpjacobs Really nice, thanks too. I'll rewrite my code for synthetic reasons ;-) I'll implement your regex of course.
I have no understanding of the Lua language, so I won't help you there.
But in Java this regex should match your input
"([a-z]*)\\s+:\\s+([\\.\\d]*)?\\s+([\\.\\d]*)?\\s+([\\.\\d]*)?"
You have to test each group to know if there is data left, center, right
Having a look at Lua, it could look like this. No guarantee, I did not see how to escape . (dot) which has a special meaning and also not if ? is usable in Lua.
"([a-z]*)%s+:%s+([%.%d]*)?%s+([%.%d]*)?%s+([%.%d]*)?"