i have a string like this:
var stringA = "id=3&staffID=4&projectID=5";
how do i use regex to replace the value of staffID=4 to staffID=10?
any help would be great
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2 Answers
You want to replace staffID use following regexp pattern,
Check this Demo jsFiddle
jQuery
str = "id=3&staffID=4&projectID=5";
str = str.replace(/staffID=\d/g, "staffID=10");
console.log(str);
Console Result
id=3&staffID=10&projectID=5
Same way you can change id, staffID and projectID using /id=(\d+)&staffID=(\d+)+&projectID=(\d+)/g, REGEXP pattern,
jQuery
str = "id=3&staffID=12&projectID=5";
str = str.replace(/id=(\d+)&staffID=(\d+)+&projectID=(\d+)/g, "id=1&staffID=2&projectID=3");
console.log(str);
Console Result
id=1&staffID=2&projectID=3
Check this Demo Hope this help you!
3 Comments
Jaykumar Patel
Thank you Welcome i add more answer details
zx81
@user1153551 Your reply answers "how do I relace staffID=4 with staffID=10. This is not what David asked. There was some context around staffID, and given the question it should be assumed that he only wants to replace the staffID number when it appears in strings formed like "id=3&staffID=4&projectID=5"
Teddybugs
that is what i want, i just need to replace the staffID, i dont care what is string infront or behind
Here is the simple regex you are looking for.
result = stringA.replace(/(id=\d+&staffID=)\d+(&projectID=\d+)/g, "$110$2");
Basically, the expression captures everything before the staffID into Group 1, and captures everything after the staffID into Group 2.
Then we replace the string with the Group 1 capture, concatenated with "10", concatenated with Group 2. That is the meaning of the "$110$2" replacement. The first number looks like 110, but the first 1 actually belongs to the $ ($1 means Group 1 in a replacement string).
1 Comment
zx81
@David You are welcome, just trying to answer according to the exact specs you gave us. :) Often, an imprecise regex will replace lots of strings that you don't want to replace. The devil is in the details.