How to match at least one non special character using Regular Expression
Today, one of my colleague came to me & asked to validate a string which should contain at least one non special character.
I think when there is a question of string validation by processing character set no one can beat Regular Expression so we started implementing it.
You might known about it already but still when I look this helpful information the first thing comes to my mind is to share.
As per your requirements you can get help from the website & design your own regular expression. So…. here comes the link.
Website URL: http://www.regextester.com/
Now, I will Explain the below regular Expression.
Regular Expression which match the string if it contain at least one non special character:
^ (\W*\w+.*)$
|
Expression |
Description |
|
^ |
Match the beginning of a line |
|
$ |
Match the end of a line |
|
() |
Capture matched substring |
|
\W |
Matches a non-word character |
|
\w |
Matches a word character, same as [a-zA-Z_0-9] |
|
* |
Zero or more matches |
|
+ |
One or more matches |
|
. |
Matches any character except \n |
So, now you know individual meaning of expression used in the above regular expression.
For getting more understanding on the regular expression refer this url: http://www.developer.com/net/cplus/article.php/10919_3485636_2.
Let’s, understand how this all work together for validate string.
^ () $ :- This will match the entire string with Expression given inside the Bracket.
\W*\w+.*
\W* :- This will match the zero/more occurrence of the non special character in the string.
For example, if u give sting like #$%@ -this will consider as valid.
\w+ :- Now, this will ensure that at least one non special character should be in string.
.* :- This will match any character except \n in the string.
