PHP Regex to grab a parameter value

Question

Technically I need to implement parse_str() using regex. Though I will only extract one parameter value from a query. I have a string like a=val1&b=val2&c=val3

is it possible to get only the value of say b using preg_match also assuming b can be the last query (means the string can also be a=val1&b=val2)?

Stupid question: why can't you use parse_str() ? It's there since php 4 — Damien Pirsy
– Damien Pirsy, Commented May 30, 2013 at 18:22
yes actually, I have to use a modified version of PHP 5.3 and it strips off html tags for parse_str() call which I need to retain using my own parse_str() implementation. :( — Roy
– Roy, Commented May 30, 2013 at 18:30

Justin Morgan · Accepted Answer · 2013-05-30 18:25:16Z

2

Seems simple enough:

/(?:^|&)b=([^&]*)/

The value you want will be in the first capture group.

answered May 30, 2013 at 18:25

Justin Morgan

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