CODEWITHSUNDEEP
javascriptregexmatch
Alex Schneider
Alex Schneider

Reputation: 355

Javascript regex match fail

Can someone explain why this does not work? (I am using Chrome Developer Console)

pattern  
-> "/Xmp\.MP\.RegionInfo\/MPRI:Regions/"
key
-> "Xmp.MP.RegionInfo/MPRI:Regions[1]"
key.search(pattern)
-> -1
key.search(/Xmp\.MP\.RegionInfo\/MPRI:Regions/)
-> -1
"Xmp.MP.RegionInfo/MPRI:Regions[1]".search(pat)
-> -1
"Xmp.MP.RegionInfo/MPRI:Regions[1]".search(/Xmp\.MP\.RegionInfo\/MPRI:Regions/)
-> 0

It make absolutely no sense to me that the search does not match if i use the variables....

Upvotes: 0

Views: 156

Answers (3)

David Hellsing
David Hellsing

Reputation: 108480

It looks like pattern is a String in your first example, it needs to be a RegExp object:

var pattern = /Xmp\.MP\.RegionInfo\/MPRI:Regions/
var key = "Xmp.MP.RegionInfo/MPRI:Regions[1]"

key.search(pattern); // equals 0

If you want to convert a string to a regex, use the RegExp constructor (but remove the slashes):

var pattern = new RegExp("Xmp\.MP\.RegionInfo\/MPRI:Regions");

http://jsfiddle.net/CpEjA/

Upvotes: 2

Krzysztof
Krzysztof

Reputation: 16130

In first case your pattern is wrapped in quotes, so it is string. In second case it is without quotes -> it is RegExp object.

Upvotes: 0

barryhunter
barryhunter

Reputation: 21091

In your example pattern appears to be a string. You need it to be a RegExp object.

Upvotes: 0

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