CODEWITHSUNDEEP
javascriptregex
Lazyexpert
Lazyexpert

Reputation: 3154

JS Regexp limit

Very simple thing, but can't find it anyways.. How can i limit a regexp result?

Example string:

io=G4-WfdxQHfBLrcB7AAAC; connect.sid=s%3AKdRP6Bh_bFsN_9Br4TfTykVSqenUgpDA.ighSSEVvoIInT%2Fc7z%2B2HaQQRzwS6p7gkEqJs2ZQbw1k; sid=s%3ACte80repoZLXoDfMqABqrNcg9qdO0a5L.1I%2BFc61dYeyqNhmjxCVMiZEPgLvgolvMIohLAx22WYo

My current regexp:

/\ssid=(.*)/

Current result is:

sid=s%3ACte80repoZLXoDfMqABqrNcg9qdO0a5L.1I%2BFc61dYeyqNhmjxCVMiZEPgLvgolvMIohLAx22WYo

Desired result is:

s%3ACte80repoZLXoDfMqABqrNcg9qdO0a5L.1I%2BFc61dYeyqNhmjxCVMiZEPgLvgolvMIohLAx22WYo

How can i improve that?

Upvotes: 1

Views: 89

Answers (1)

nu11p01n73R
nu11p01n73R

Reputation: 26667

You can use the first capture group as

match = str.match(/\ssid=(.*)/);
// match[0] will contain match after the `=`

Or more simply you can write

match = str.match(/\ssid=(.*)/)[1];

Example

str = "io=G4-WfdxQHfBLrcB7AAAC; connect.sid=s%3AKdRP6Bh_bFsN_9Br4TfTykVSqenUgpDA.ighSSEVvoIInT%2Fc7z%2B2HaQQRzwS6p7gkEqJs2ZQbw1k; sid=s%3ACte80repoZLXoDfMqABqrNcg9qdO0a5L.1I%2BFc61dYeyqNhmjxCVMiZEPgLvgolvMIohLAx22WYo"  
match = str.match(/\ssid=(.*)/)[1];
// Output
// => s%3ACte80repoZLXoDfMqABqrNcg9qdO0a5L.1I%2BFc61dYeyqNhmjxCVMiZEPgLvgolvMIohLAx22WYo

From MDN

(x)

Matches x and remembers the match. These are called capturing parentheses.

For example, /(foo)/ matches and remembers "foo" in "foo bar". The matched substring can be recalled from the resulting array's elements [1], ..., [n] or from the predefined RegExp object's properties $1, ..., $9.

Capturing groups have a performance penalty. If you don't need the matched substring to be recalled, prefer non-capturing parentheses (see below).

Upvotes: 1

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