Regular Expressions 101

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/
(?:SRC=([^ ]*))
/
Non-capturing group
(?:SRC=([^ ]*))
SRC=
matches the characters SRC= literally (case sensitive)
1st Capturing Group
([^ ]*)
Match a single character not present in the list below
[^ ]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
matches the character with index 3210 (2016 or 408) literally (case sensitive)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/

Test String