Regular Expressions 101

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/
((?<=Sub Total )\d[.]\d)|((?<=GST \d\d% )\d[.]\d|(?<=GST \d% )\d[.]\d)|((?<=Total )\d[.]\d)
/
gm
1st Alternative
((?<=Sub Total )\d[.]\d)
1st Capturing Group
((?<=Sub Total )\d[.]\d)
Positive Lookbehind
(?<=Sub Total )
Assert that the Regex below matches
Sub Total matches the characters Sub Total literally (case sensitive)
\d
matches a digit (equivalent to [0-9])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
Match a single character present in the list below
[.]
. matches the character . literally (case sensitive)
\d
matches a digit (equivalent to [0-9])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
2nd Alternative
((?<=GST \d\d% )\d[.]\d|(?<=GST \d% )\d[.]\d)
2nd Capturing Group
((?<=GST \d\d% )\d[.]\d|(?<=GST \d% )\d[.]\d)
1st Alternative
(?<=GST \d\d% )\d[.]\d
Positive Lookbehind
(?<=GST \d\d% )
Assert that the Regex below matches
GST matches the characters GST literally (case sensitive)
\d matches a digit (equivalent to [0-9])
\d matches a digit (equivalent to [0-9])
% matches the characters % literally (case sensitive)
\d
matches a digit (equivalent to [0-9])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
Match a single character present in the list below
[.]
. matches the character . literally (case sensitive)
\d
matches a digit (equivalent to [0-9])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
2nd Alternative
(?<=GST \d% )\d[.]\d
Positive Lookbehind
(?<=GST \d% )
Assert that the Regex below matches
GST matches the characters GST literally (case sensitive)
\d matches a digit (equivalent to [0-9])
% matches the characters % literally (case sensitive)
\d
matches a digit (equivalent to [0-9])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
Match a single character present in the list below
[.]
. matches the character . literally (case sensitive)
\d
matches a digit (equivalent to [0-9])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
3rd Alternative
((?<=Total )\d[.]\d)
3rd Capturing Group
((?<=Total )\d[.]\d)
Positive Lookbehind
(?<=Total )
Assert that the Regex below matches
Total matches the characters Total literally (case sensitive)
\d
matches a digit (equivalent to [0-9])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
Match a single character present in the list below
[.]
. matches the character . literally (case sensitive)
\d
matches a digit (equivalent to [0-9])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
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