Regular Expressions 101

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`
(?i)(password["',=]+)[^"',]+(["',]*)
`
gm
(?i)
match the remainder of the pattern with the following effective flags: gmi
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
1st Capturing Group
(password["',=]+)
password
matches the characters password literally (case insensitive)
Match a single character present in the list below
["',=]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
"',=
matches a single character in the list "',= (case insensitive)
Match a single character not present in the list below
[^"',]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
"',
matches a single character in the list "', (case insensitive)
2nd Capturing Group
(["',]*)
Match a single character 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 a single character in the list "', (case insensitive)
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.

Regular Expression
No Match

`
`
gm

Test String