Regular Expressions 101

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/
id=(\d*)&tok=(.*)
/
id= matches the characters id= literally (case sensitive)
1st Capturing Group
(\d*)
\d*
matches a digit (equal to [0-9])
* Quantifier — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy)
&tok= matches the characters &tok= literally (case sensitive)
2nd Capturing Group
(.*)
.*
matches any character (except for line terminators)
* Quantifier — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/

Test String