Ruby on rails check if string is numeric. email) is equal to another string, (@user.

• Ruby on rails check if string is numeric png' Jun 24, 2015 · Trying to work out how to parse out phone numbers that are left in a string. I am doing this: class String def Dec 27, 2010 · What is the easiest way to find out in Rails 3 whether a string str contains a positive float number or not ? ( str is not an attribute in an active-record model) It should work like this: Mar 10, 2012 · In my rails app, I'm trying to check if one string (current_user. "123abc" !~ /\D/ # => false "123" !~ /\D/ # => true Related External Links: Stack Overflow - check-if-string-contains-only-positive-numbers-in-ruby Test if string is a number in Ruby on Rails (13 answers) Closed 11 years ago . How can I see if the string is numeric? 0. 1. 34' is_number?( my_string ) # => true Extend String Class. active? %> <%= image_tag('on. to_i. In that case, a false is returned. -1005. eql? string result = true end result end But the problem arises when a string starts with 0. "Hi Han, this is Chewie, Could you give me a call on 02031234567" "Hi Han, this is Chewie, Could you give me May 27, 2014 · I am wondering what is a convenient function in Rails to convert a string with a negative sign into a number. I just need it to be a valid base 10, positive integer string. Test if string is a number in Ruby on Rails. ex: isnumber(‘text’) ==> false isnumber(‘22’) ==> true. Apr 13, 2013 · pre_check("test". Code: def numeric_string?(string) !!Float(string) rescue false end # Usage example: puts numeric_string?('123') # Output: true puts numeric_string?('abc') # Output: false Sep 2, 2007 · how to check string to know if it is number or not. email). email) is equal to another string, (@user. When I use the . to_f method, the number becomes 1005 with the negative sign and decimal part being ignored. length != 0 Anyway, using that code inside an else if is a bit verbose, I would encourage you to define the present? method inside the String class. Thank you, specifically, for including commentary on the fact that the questioners original point of figuring out if something is in an array "without looping through it" is impossible, even if the loop may be hidden away behind an easy method call like Array#include?-- and how to actually avoid such (using Set), should that be important. Apr 12, 2011 · In addition to previous answers: has_key? and has_value? have shorter alternatives in form of key? and value?. to_f result in proper value that means it is valid numeric format. The valid string should contain only chars a-zA-Z0-9 My code looks Dec 27, 2010 · What is the easiest way to find out in Rails 3 whether a string str contains a positive float number or not ? ( str is not an attribute in an active-record model) It should work like this: Mar 10, 2012 · In my rails app, I'm trying to check if one string (current_user. You can get it with regex. Thanks. Generally if you expect a string at this point in the code and a value is nil instead, that implies something unexpected has occurred and an exception being raised is appropriate. Oct 21, 2015 · I am trying to validate strings in ruby. Sep 2, 2007 · how to check string to know if it is number or not. Mar 21, 2016 · I was importing string values and needed to check that it was a positive number. is_string?) Now your project requirement will change and every String with three characters or more is no longer defined as String (i know its unusual ;)) Now you can change your own method easily. puts "The String #{s} has a number in it. That is not always the best goal. def is_number? string true if Float(string) rescue false end And then call it like this: my_string = '12. here is some valid string format examples: However, since ruby can make any numeric from string Dec 27, 2010 · What is the easiest way to find out in Rails 3 whether a string str contains a positive float number or not ? (str is not an attribute in an active-record model) It should work like this: Mar 21, 2016 · I was importing string values and needed to check that it was a positive number. 'abc'), is there any easy way to do this in ruby or Rails 3 ? Nov 24, 2011 · @Gary's advice holds if your goal is to minimize exceptions raised in this part of the code. See it here. I'll give some examples for checking if the string is an integer, which might be sufficient for you. ex: isnumber ('text') ==> false isnumber ('22') ==> true. How would I do this with an if/else statement? I tried Apr 14, 2011 · Ruby: How to check if a String is numeric. class String def present? !empty? end end Now you can write your code the following way: if some_condition # do something elsif variable. 32. I have a string "1234223" and I want to check whether the value is an integer/number. Sep 27, 2018 · Given any string X, if x. present? # do something else end. " else puts "The String #{s} does not have a number in it. 0-9]+/ # Calling String's =~ method. png', :alt => "Active", :border => 0) %> <% else %>; &lt;%= image_tag('off. Feb 23, 2017 · lookAhead is a single character picked out of the string (moving by one space each time it loops through) and these two methods determine if it is a character or a digit, returning the appropriate token type. to_s. Heres a simple regex to check this. '3. Mar 16, 2014 · I want to check weather variable contains a valid number or not. Posted 14 April 2011 in programming, Finally, a technical article… This one caused by a seemingly simple question on Stack Overflow, asking how to Test if string is a number. Checking for floats, rationals, etc will be more complex. Description: Determine if a string represents a valid numeric value in Ruby on Rails. Jason Ruby on Rails Discussions Nov 25, 2010 · I want to check if a value is true or false. "123abc" !~ /\D/ # => false "123" !~ /\D/ # => true Related External Links: Stack Overflow - check-if-string-contains-only-positive-numbers-in-ruby Mar 10, 2016 · any_string. Others are converted using +to_int+ and +to_i+. s = 'abc123' if s =~ /[-. If _arg_ is a +String+, leading radix indicators (+0+, +0b+, and +0x+) are honored. This example will only work for positive integers. Ruby team also suggests using shorter alternatives, but for readability some might still prefer longer versions of these methods. There are a few ways to do this. The valid string should contain only chars a-zA-Z0-9 My code looks Sep 28, 2016 · def check_string(string) result = false if string. Jun 4, 2007 · Numeric types are converted directly (with floating point numbers being truncated). 1? Apr 18, 2013 · You can check if the number is the same when you change it to integer. Check if a string contains a numeric value in Ruby on Rails. 2', '1') or alphabet string (e. Apr 5, 2011 · I would like to check if a variable's string value is a number string (e. " end Apr 28, 2011 · I wanted to validate 'numericality' of a string (its not an attribute in an active-record model). <% if item. How can I do it in Rails 3. to_i != 0 Granted, you’ll need a separate check if the number actually can be 0, but String#to_i returns 0 when there is no number. Jun 15, 2016 · The implementation described below focuses on number validation in Ruby. More precisely, it will check if the “content” of a given input of an arbitrary type belongs to one of the following Feb 27, 2012 · I have the string "08" and I like to know if this string is numeric. e. g. Any string which contains spaces,under scores or any special char should fail validation. Jul 9, 2007 · if params[:some_key]. glz esjeh yxr wutmm nwdg glpcfy qsra djyxi ttle rzae