Regular Expressions 101

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/
{(if '?{?)?(.*?)_en-us(.*?)}
/
mg
{ matches the character { with index 12310 (7B16 or 1738) literally (case sensitive)
1st Capturing Group
(if '?{?)?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
if
matches the characters if literally (case sensitive)
'
matches the character ' with index 3910 (2716 or 478) literally (case sensitive)
{
matches the character { with index 12310 (7B16 or 1738) literally (case sensitive)
2nd Capturing Group
(.*?)
.
matches any character (except for line terminators)
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
_en-us
matches the characters _en-us literally (case sensitive)
3rd Capturing Group
(.*?)
.
matches any character (except for line terminators)
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
} matches the character } with index 12510 (7D16 or 1758) literally (case sensitive)
Global pattern flags
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
mg

Test String