How can I tell the number of instances of a substring within a string?

[Meir]

I have customers entering up to three titles. Occasionally they add a linebreak tag to have more control on appearances.

 

Currently, there is an email field in a static position, but they want it to shift down a line only if the titles take up 4 lines.

 

I have a rule that outputs the all the titles formatted as one variable, and breaks those lines with a linebreak tag.

 

How can I count the number of instances of "<br>" in the output string?

[step]

You can use this to determine the number of break tags in a string:

var str = Rule("Your format rule"); // Titles
return str.match(/\<br\>/g).length;

 

Or you could assign that to a variable and move your static text like so:

var titles = Rule("Your format rule");
var breaks = titles.match(/\<br\>/g).length; // Number of breaks
var email = "<br>static@emailaddress.com";
return (breaks < 4) ? title + email : title + email.replace("<br>","<br><br>");

[Meir]

I tried

 

var str = Rule("Title Copyfit Rule"); // Titles

if (str.match(/\<br\>/g).length == 4)

return "<br>"

else return ""

[step]

Did that work?

[Meir]

Ahh sorry. I forgot it cuts off everything you write after and end code block.

 

No it did not work. I am getting an error when there are either no titles or the title(s) can all fit on one line:

 

TypeError: str.match(/\<br\>/g) has no properties)

 

I need to edit the code to be able to continue if there are no properties. Right now that if statement errors out.

[step]

Is that the error you get at validation? Does it preview/compose correctly?

 

You could add a try/catch statement when defining your variables so that if the match function can't find any breaks, it will default to being defined as 0.

try {var breaks = Rule("Title Copyfit Rule").match(/\<br\>/g).length;} catch(e){var breaks = 0;}
var result = "";

if (breaks == 4) 
   result = "<br>";

return result;

[David Miller]

I believe you can edit Step's original code as well. Edits are in Red.

 

var str = Rule("Your format rule"; // Titles
return [color="red"]([/color]str.match(/\<br\>/g)[color="red"]||[])[/color].length;

 

Or

 

var titles = Rule("Your format rule");
var breaks = [color="red"]([/color]titles.match(/\<br\>/g)[color="Red"]||[])[/color].length; // Number of breaks
var email = "<br>static@emailaddress.com";
return (breaks < 4) ? title[color="red"]s[/color] + email : title[color="red"]s[/color] + email.replace("<br>","<br><br>");

 

The ||[] will cause the match to return null when there are no line-break tags.

[Meir]

adding the parenthesis and ||[]) did the trick.

 

Thank you.