Regular Expressions 101

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/
src\s*="(.+?)"
/
gm
src
matches the characters src literally (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
="
matches the characters =" literally (case sensitive)
1st Capturing Group
(.+?)
.
matches any character (except for line terminators)
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
" matches the character " with index 3410 (2216 or 428) literally (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String