CODEWITHSUNDEEP
javascriptregex
prime
prime

Reputation: 63

Regex with dynamic requirement

Suppose I have string:

var a = '/c/Slug-A/Slug-B/Slug-C'

I have 3 possibility:

var b = 'Slug-A' || 'Slug-B' || 'Slug-C'

My expectation:

if (b === 'Slug-A') return 'Slug B - Slug C';
if (b === 'Slug-B') return 'Slug A - Slug C';
if (b === 'Slug-C') return 'Slug A - Slug B';

What I've done so far:

a.replace(b,'')
.replace(/\/c\//,'') // clear /c/
.replace(/-/g,' ')
.replace(/\//g,' - ')

Then, I'm stuck

Any help would be appreciated. Thanks

Upvotes: 1

Views: 87

Answers (3)

Cyril Cherian
Cyril Cherian

Reputation: 32327

Do it this way

var a = '/c/Slug-A/Slug-B/Slug-C'
var b = 'Slug-A'
 //var b = 'Slug-B'
 //var b = 'Slug-C'

var k = a.replace(b,'')
.replace(/\/c\//,'') // clear /c/
.replace(/-/g,' ')
.match(/[a-zA-Z -]+/g).join(" - ")

console.log(k)

working array here

Upvotes: 0

Rajshekar Reddy
Rajshekar Reddy

Reputation: 18987

Try this, I made it as simple as possible.

var a = '/c/Slug-A/Slug-B/Slug-C';
var b = 'Slug-A';

var regex = new RegExp(b+'|\/c\/|-|\/','g');

alert(a.replace(regex, " ").trim().replace(/(\s.*?)\s+/,'$1 - '));

//OR

alert(a.replace(regex, " ").trim().match(/\w+\s\w/g).join(' - '));

Explanation

1) b+'|\/c\/|-|\/','g' = matches b value, /c/ , - and /

2) a.replace(regex, " ") = replace all the matched part by space. so a would beSlug A Slug B

3) .replace(/(\s.*?)\s+/,'$1 - ') = match two spaces with anything within the spaces. And then replace it with the match + ' - ' appended to it.

Note that we have grouped the part (\s.*?) in the regex (\s.*?)\s+. So this grouping is done so that It can be used while replacing it with a new text. $1 holds the grouped part of the matched text so $1 = " A". So what I am doing is I match the regex Eg : " A " and replace only the grouped part ie " A" with " A" + " - " = " A - ".

4) .match(/\w+\s\w/g).join(' - ') = match all the part where characters followed by a space followed by a character. match will return a array of matched parts. So then I join this array by using join.

Upvotes: 1

Zamboney
Zamboney

Reputation: 2010

Try this:

var a = '/c/Slug-A/Slug-B/Slug-C'
var b = 'Slug-A' || 'Slug-B' || 'Slug-C'
var reg = new RegExp(b.replace(/([A-z]$)/,function(val){return '[^'+val+']'}),'g');
a.match(reg).map(function(val){return val.replace('-',' ')}).join(' - ');

Explication:

the replacement of the string b catch the last latter of the string and replace it with the ^ regex sign. this mean that instead of capture it it will ignore it.

That mean that mean that now it will match only the Slag- that isn't contain the last char.

All there is to do is to return it with any join you like.

Upvotes: 1

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