Regular Expressions 101

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"""
\b(?:VERSION|FREQ)="(.*?)"
"""
g
\b assert position at a word boundary: (^\w|\w$|\W\w|\w\W)
Non-capturing group
(?:VERSION|FREQ)
1st Alternative
VERSION
VERSION
matches the characters VERSION literally (case sensitive)
2nd Alternative
FREQ
FREQ
matches the characters FREQ literally (case sensitive)
="
matches the characters =" literally (case sensitive)
1st 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 3410 (2216 or 428) literally (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.

Regular Expression
No Match

r"""
"""
g

Test String

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For a full regex reference for Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html