Regular Expression Replace in Javascript

Question

Test 1
Test & Test 2
Test,Test 2
Test-Test2
Test/Test2
Test. Test2
Test 1 Test 2 Test 3
Test 1 Test 2 - Test 3, Test 4, Test 5

I have the following string array, I need to replace this via javascript regex to convert all of these to lowercase and separated with -.

Expected output

test-1
test-test-2
test-test2

I have been using this till now

link = str.replace(new RegExp("[^a-zA-Z0-9-]", "gi"), "-").toLowerCase();
link = link.replace("--", "-");

The last line of the expected output shouldn't have a - before the 2? Is that correct? If so, how are you distinguishing it from the first line? — user2437417
– user2437417, Commented May 31, 2013 at 17:33

user2437417 · Accepted Answer · 2013-05-31 17:28:13Z

2

I would remove the - from the regex, and add the + to describe one or more of the characters to be replaced.

var str = "Test 1 Test 2 - Test 3, Test 4, Test 5"
var regex = new RegExp("[^a-zA-Z0-9]+", "gi");

str.replace(regex, "-").toLowerCase(); // "test-1-test-2-test-3-test-4-test-5"

answered May 31, 2013 at 17:28

user2437417

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Comments

Dogbert · Accepted Answer · 2013-05-31 17:28:52Z

0

Use .toLowerCase and this regexp: /[^a-z0-9-]+/g

'Test & Test 2'.toLowerCase().replace(/[^a-z0-9-]+/g, '-')
#=> 'test-test-2'

+ will match 1 or more occurrences, so it'll replace all consecutive characters, and replace them with a single -

answered May 31, 2013 at 17:28

Dogbert

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