Get value out of query string with regex? [duplicate]

Question

I want to find the value corresponding to a specific key1 in QUERY_STRING using regex.

example :

"page?key1=value1&key2=value2&key3=value3"

"page?key2=value2&key1=value1&key3=value3"

"page?key2=value2&key3=value3&key1=value1"

I've found a regex like the one below, but it doesn't work the way I want it to in this situation.

key1=([^&]*)

"page?kkkkkkkey1=value1&key2=value2&key3=value3"

"page?key2=value2&kkkkkkey1=value1&key3=value3"

"page?key2=value2&key3=value3&kkkkkkey1=value1"

No, don't use regex. Use the appropriate URL parser of your language. — Bergi
– Bergi, Commented Jun 17, 2022 at 5:31
"it doesn't work the way I want it to in this situation" - what do you want then? — Bergi
– Bergi, Commented Jun 17, 2022 at 5:32

Tolis Gerodimos · Accepted Answer · 2022-06-17 05:32:11Z

1

You could try

(\&|\?)key1=([^&]*)

This way the regex will match only if the the key1 is prepended by & or ?

Note: Now the value will be the second parenthesis match

answered Jun 17, 2022 at 5:32

Tolis Gerodimos

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