Saturday, 1 December, 2018 UTC
Summary
I've started building out our JavaScript Glossary and when I got to the replace() method, I had to build out a snippet to handle replacing all occurrences of a string in a string.
Only Replaces One
https://scotch.io/embed/gist/7be587f89ba2ee18f105a57a791a2c18
Replaces All with literal regular expression
Normally String replace() only replaces the first instance it finds. If we want JavaScript to replace all, we'll have to use a regular expression using
/g .https://scotch.io/embed/gist/452b0b9c2ff1d4ddf1ae3449f90ef595
Using RegExp()
In addition to using the inline
/g , we can use the constructor function of the RegExp object.myMessage.replace(new RegExp('sentence', 'g'), 'message');https://scotch.io/embed/gist/fcd4396ee879d3ccc306512a59e2608a
Replacing Special Characters
To replace special characters like
-/\^$*+?.()|[]{}) we'll need to use a \ backslash to escape them.Here we'll replace all the
- in this string with just -. I ran into this when building out the Scotch dashboard with markdown trying to escape all my symbols.// replace - with -
myUrl.replace(/-/g, '-');
// or with RegExp
myUrl.replace(new RegExp('-', 'g'), '-');https://scotch.io/embed/gist/d1d233fb4ff5264cd50b8208a03dcf84