Tutorial :How can I check if a string contains a specific charater in Regex?



Question:

How can I check if a string contains at any position one or more '/' character(s) in Regex?

Thanks.


Solution:1

Do you really need to check to see if a string has '/' in it? If so, you might consider using what's probably a built-in method in whatever language you're writing your code in:

bool containsSlash = myString.IndexOf('/') >= 0;  

Otherwise, you can "escape" the character by using the following notation;

\/  


Solution:2

escape it with a backslash, e.g. /


Solution:3

By escaping it with a \ (backslash).


Solution:4

Regex APIs tend to be implementation specific so we'll need to know what language / tool you are using to give a 100% correct answer. But the quick one is simply

.*\/.*  

However for this type of question, it's much more efficient to use a string searching API. Regex's are best at matching patterns. Filtering out for a single character is best done through IndexOf or a similar function.


Solution:5

You don't need a regexp for this, there are far cheaper ways to scan for a character. If you are using c I suggest you use strrchr. From the manpage:

char * strrchr(const char *s, int c);  

The strrchr() function locates the last occurrence of c (converted to a char) in the string s. If c is \0', strrchr() locates the terminating \0'.

For example:

bool contains(char c, char* myString) {    return 0 != strrchr(myString, c);  }    contains("alex", 'x'); // returns true  contains("woo\\123", '\\'); // returns true  


Solution:6

In c#:

String sss = "<your string>";  Regex re1 = new Regex(@".*/.*");    if (re1.IsMatch(sss)) .....  


Solution:7

You probably want \/+. However it depends on engine.


Solution:8

I'll give it to you in pseudo-Perl because you didn't ask for anything specific.

$has_slash = 0;  # first slash starts regex  # backslash escape the next slash  # because it is escaped, we're looking for this as a literal slash  # end the regex pattern with the final slash  if ($string =~ /\//) {      $has_slash = 1;  }  

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