Regular Expressions 101

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/
(EXT|GEN)_CODE\d{1,3}=
/
gm
1st Capturing Group
(EXT|GEN)
1st Alternative
EXT
EXT matches the characters EXT literally (case sensitive)
2nd Alternative
GEN
GEN matches the characters GEN literally (case sensitive)
_CODE matches the characters _CODE literally (case sensitive)
\d{1,3}
matches a digit (equal to [0-9])
{1,3} Quantifier — Matches between 1 and 3 times, as many times as possible, giving back as needed (greedy)
= matches the character = 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