Regular Expressions 101

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/
\$\(['|"](.[^\)]*)['|"]\)\.addClass\(['|"]btnDisabled['|"]\)
/
gm
\$ matches the character $ with index 3610 (2416 or 448) literally (case sensitive)
\( matches the character ( with index 4010 (2816 or 508) literally (case sensitive)
Match a single character present in the list below
['|"]
'|"
matches a single character in the list '|" (case sensitive)
1st Capturing Group
(.[^\)]*)
. matches any character (except for line terminators)
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 4110 (2916 or 518) literally (case sensitive)
Match a single character present in the list below
['|"]
'|"
matches a single character in the list '|" (case sensitive)
\) matches the character ) with index 4110 (2916 or 518) literally (case sensitive)
\. matches the character . with index 4610 (2E16 or 568) literally (case sensitive)
addClass
matches the characters addClass literally (case sensitive)
\( matches the character ( with index 4010 (2816 or 508) literally (case sensitive)
Match a single character present in the list below
['|"]
'|"
matches a single character in the list '|" (case sensitive)
btnDisabled
matches the characters btnDisabled literally (case sensitive)
Match a single character present in the list below
['|"]
'|"
matches a single character in the list '|" (case sensitive)
\) matches the character ) with index 4110 (2916 or 518) 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.

Regular Expression
No Match

/
/
gm

Test String