Shoutbox

i want to do something really simple - to locate numbers for calculation

function...
    var reg_exp = "([0-9\*\/+\-()]*)";

    if( Messege.match( new RegExp(reg_exp) ) ){
        return Messege.replace(new RegExp(reg_exp,'gi'),"[$1]");
    }

...

Using the function above, should do this :

input : "Havelåge 5+5+5-(5*6) sdsd"
output : "Havelåge [5+5+5-(5*6)] sdsd"

but instead it : "[]H[]a[]v[]e[]l[]å[]g[]e[] [5][]+[5][]+[5][]-[]([5][]*[6][])[] []s[]d[]s[]d[]"


what am i doing wrong ???

Try using:

code:

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return Message.replace(/[0-9\*\/+\-()]*/g, "[$1");

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Also, I don't know a ton about regular expressions, but that one looks a bit flawed to me.

code:

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Message.replace(/([0-9+\-()*\\\/]+)/,"[$1]")

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Should work

deAd: $1-9 won't work unless you use (). So for each $ you need a set of ().

Well there were parentheses, but they would always return a blank string -- that's why I said it looked flawed...but I didn't try to correct it because (1) not exactly sure what they're trying to accomplish, and (2) since I'm not so good at regular expressions, I figured I'd just leave it as it was..

quote:

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Originally posted by Silentdragon

code:

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Message.replace(/([0-9+\-()*\\\/]+)/,"[$1]")

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Should work

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no way

/([0-9+\-()*\\\/]+)/

'+' after numeric gives trouble
')*' will look for more ')'
'\\' why look for backlash ?
']+' i guess *(start) is more appropriate ??

you are right about the () => $1 matching, which is what im looking for

i tried you solution didn't do what i wanted though, actually nothing... im trying a modified version

thanks anyway

Actually, ")*" will not look for more ")"s, unless you specify that the ")" in that case is a character, and in that expression ")" is being used to end a sub-match (whatever you call it...).

ohhh... that might explain something... if the ')' is un-escaped, it might make a submatch...

so, i need to escape the ')'

Yes

EDIT: What exactly are you trying to do?

i want to find calculations within a text string...

lets say i write
"hello jim, i have 25*20 dollars"
then my plugin calculated the amount -->
"hello jim, i have 500 dollars"

so i want to match simple math pieces

Well then I think you're going about it wrong. Here is a better way to do it. The code, however, is a bit messy. This will evaluate division, multiplication, addition, and subtraction (/, *, +, -). It uses the eval() function. It accepts decimals and disregards whitespace. However, there is only support for problems with two numbers (3*4*5 won't work).

code:

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var Str = "Did you know that 5 time 5 is 5*5? Did you know that 8 plus 8 is 8+8?";

    var RegExp = /[\d.]+[\s]*[*/+-][\s]*[\d.]+/g;

    Str = Str.replace(RegExp, function(){ var res = eval(RegExp.exec(Str)[0]); RegExp.lastIndex++; return res; } );

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