Windows – Regex: Select text/string between symbols that contains another symbol (tags that contains specific string)

Use this regex:

period_1_(.*)\.ssa

For example, in Perl you would extract it like this:

my ($substr) = ($string =~ /period_1_(.*)\.ssa/);

For Python, use this code:

m = re.match(r"period_1_(.*)\.ssa", my_long_string)
print m.group(1)

Last print will print string you are looking for (if there is a match).