I am using this regex expression for an input. When I try it in Chrome, it works well, but not when I try in IE. The regex editor that I am using advice me that the negative look-behind expression could not work for some browsers.
How can I adapt the expression to make it work for IE? I am using it to make impossible to end the input with /.
(^(?!.*\/\/)^(?!^\/)[A-Za-z0-9\/\-?:().,'+\s]+(?<!\/))
Negative look-behind expression not working in IE:
(?<!\/))
Thanks in advance and best regards.
If you don't want a / at the end of the string, you could add another lookahead.
^(?!.*\/\/)^(?!^\/)(?!.*\/$)[A-Za-z0-9\/\-?:().,'+\s]+
Regex demo
But in that case, it might be easier to use a version where the / is not in the character class but optionally repeated preceding the character class.
This way, it can not occur at the start or at the end of the string, and there can also not be //
^[A-Za-z0-9?:().,'+\s-]+(?:\/[A-Za-z0-9?:().,'+\s-]+)*$
Regex demo
Related
I'm creating a javascript regex to match queries in a search engine string. I am having a problem with alternation. I have the following regex:
.*baidu.com.*[/?].*wd{1}=
I want to be able to match strings that have the string 'word' or 'qw' in addition to 'wd', but everything I try is unsuccessful. I thought I would be able to do something like the following:
.*baidu.com.*[/?].*[wd|word|qw]{1}=
but it does not seem to work.
replace [wd|word|qw] with (wd|word|qw) or (?:wd|word|qw).
[] denotes character sets, () denotes logical groupings.
Your expression:
.*baidu.com.*[/?].*[wd|word|qw]{1}=
does need a few changes, including [wd|word|qw] to (wd|word|qw) and getting rid of the redundant {1}, like so:
.*baidu.com.*[/?].*(wd|word|qw)=
But you also need to understand that the first part of your expression (.*baidu.com.*[/?].*) will match baidu.com hello what spelling/handle????????? or hbaidu-com/ or even something like lkas----jhdf lkja$##!3hdsfbaidugcomlaksjhdf.[($?lakshf, because the dot (.) matches any character except newlines... to match a literal dot, you have to escape it with a backslash (like \.)
There are several approaches you could take to match things in a URL, but we could help you more if you tell us what you are trying to do or accomplish - perhaps regex is not the best solution or (EDIT) only part of the best solution?
I'm using a regex to validate a form input. So basically a user can input "SELECT some_name of select_match".
So far I have the regex: \bSELECT\b \bof select_match\b
The last part is the middle part, which I think should be [a-zA-Z] but I'm not sure how to place it in the middle. I've read multiple pages but can't get it to work.
Also preferably I'd like the regex to ignore spaces between "SELECT" and of "select_match". Meaning that SELECT blabla of select_match and SELECT blabla of select_match would both be validated as correct.
Can anyone tell me how to do this? Thank you.
If I understood you correctly, this should work:
/^SELECT\s+(\w+)\s+of select_match$/
Notes:
This allows any number of spaces between "SELECT" and the match_name; and between the match_name and the "of" (but, at least 1. To change to at least 0, change the \s+ to a \s*)
After that, the rest of the string must be exactly like that (same spaces and words exactly).
The match_name will be in match group 1.
If this doesn't work, show a bit of your code (where you use it) and we can try to find the problem.
Note: If you are using it in ng-pattern lose the "/"s (being the pattern: ^SELECT\s+(\w+)\s+of select_match$).
Note2: If you are using it in a string, remember you might need to escape every "\" (making it a "\", and the result: ^SELECT\\s+(\\w+)\\s+of select_match$
I have this variable 1874;#Bob Williams. I tried this and it should give me 1874 but it's giving me the entire variable. Any idea?
(?<=\w+;)
Whatever tool/engine you're using is removing what it matches and returns what remains after removal, so this should work for you: ;.+
A bit off topic but you dont need a regex for this. Not at all. Use Substringinstead:
var s = "1874;#Bob Williams";
s = s.Substring(0, s.IndexOf(';')); // If your input might not contain a semi colon, check the return of IndexOf
// s == "1874"
Demo
If you are writing .NET code as your tag show, use this.
I have such a code ng-init="validationRegex = '#RegularExpression.expression'" where RegularExpression.expression is c# string variable = "(\w+\/|\w+\\)+(\w+)\.\w+". I want to pass variable value to angular controller using ng-init. But in the end I get (w+/|w+\)+(w+).w+. How can I get right value?
I assume that your C# code is actually: #"(\w+\/|\w+\\)+(\w+)\.\w+". The # avoids needing the evil escaped escape.
You will likely need to use the evil escaped escape in this case. Note that you don't need to escape the / if you are putting it directly in a string (if you are using it how I think you are). You can also use braces to minimize the escaping. So you can take this regex:
(\w+/|\w+\\)+(\w+)[.]\w+
and pass it through regex planet to get this:
"(\\w+/|\\w+\\\\)+(\\w+)[.]\\w+"
I would not recommend manual conversion since you already have an escaped backslash.
Double escape the string using:
#RegularExpression.expression.Replace(#"\", #"\\")
When it comes through on the JavaScript side it will be singly-escaped again.
i am trying to use angular ui.mask module to display a full length url based on user entering a section name(suffix)
http://www.example.com/XYZ where 'XYZ' is the user input.
While a mask 'http://www.example.com/AAA' works fine, it does limit the user to entering only 3 character.
Any quick ways to extend the length accepted?
I tried altering the regex to accept variable length, but haven't got this working.
Any help would be appreciated.
Thanks.
This can be accomplished by using a question mark before any character in the mask that would be optional.
In your case, it would look like:
ui-mask='http://www.example.com/?A?A?A?A?A?A?A?A?A?A?A?A?A?A?A?A'
Better late than never...