I have a string that look something like
something30-mr200
I would like to get everything after the mr (basically the # followed by mr) *always there is going to be the -mr
Any help will be appreciate it.
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6 Answers
You can use a regexp like the one Bart gave you, but I suggest using match rather than replace, since in case a match is not found, the result is the entire string when using replace, while null when using match, which seems more logical. (as a general though).
Something like this would do the trick:
function getNumber(string) {
var matches = string.match(/-mr([0-9]+)/);
return matches[1];
}
console.log(getNumber("something30-mr200"));
Comments
var result = "something30-mr200".split("mr")[1];
or
var result = "something30-mr200".match(/mr(.*)/)[1];
1 Comment
Bart Kiers
You forgot to close the string
"mr.Why not simply:
-mr(\d+)
Then getting the contents of the capture group?
Comments
What about:
function getNumber(input) { // rename with a meaningful name
var match = input.match(/^.*-mr(\d+)$/);
if (match) { // check if the input string matched the pattern
return match[1]; // get the capturing group
}
}
getNumber("something30-mr200"); // "200"
answered Oct 14, 2009 at 20:36
Christian C. Salvadó
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4 Comments
treznik
Wow, almost identical solution, practically at the same time. Cheers :).
Gumbo
Are you sure you want to test
match[1]? This will be evaluated to false if it’s 0.
Christian C. Salvadó
@Gumbo: It wont evaluate false, because the matches are Strings not Numbers, it will only evaluate to false if match[1] is an empty string.
treznik
Heh, it would evaluate false if it would be a string containing '0' only in PHP, hence the confusion, probably. That's a stupid thing to do, btw.
This may work for you:
// Perform the reg exp test
new RegExp(".*-mr(\d+)").test("something30-mr200");
// result will equal the value of the first subexpression
var result = RegExp.$1;
2 Comments
Bart Kiers
There's no need to include the first
.* and the hyphen needs no escaping. This works as well: "-mr(.*)". But the .* is dangerous: if there's a lot more text after "-mr" the .* will "eat" it. Of course, the OP wasn't really clear about what text could come after "-mr".
Joe D
That's a good point. I was assuming that the OP would want everything after the "-mr". I modified the code to remove the escape before the hyphen and restrict the subexpression to digits. I escape everything out of habit more than anything else. :)
What about finding the position of -mr, then get the substring from there + 3?
It's not regex, but seems to work given your description?
