Regex: Using a variable as a modifier

[mikesta707]

s it possible to use a variable as a modifier for a regex pattern.

 

for example:

 

Code:

mod = "^";
match = "string to match";

string.match(mod + match);

 

[Psycho]

Yes, but you'll probably need to use the regular expression object. The formatting of the regex is slightly different. But, here's an example:

 

This would find if the letter 'O' appears twice in succession in a string:

string.match(/O{2}/)

 

To make the letter you are testing against dynamic, you could use the regular expression object. Notice that when creating the regex object that the beginning and ending forward slashes are dropped. Also, there are specific modification that need to be make for keywords.

  function matchCustom(string, searchStr)
  {
    var regEx = new RegExp(searchStr+'{2}')
    if (string.match(regEx)) {
        alert('true');
    } else {
        alert('false');
    }

  }

 

See this page for more info: http://www.regular-expressions.info/javascript.html