Regular Expressions 101

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/
<tns:Name>CASE_ID<\/tns:Name>\s*<tns:Value>([^\<]+)
/
gm
<tns:Name>CASE_ID<
matches the characters <tns:Name>CASE_ID< literally (case sensitive)
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
tns:Name>
matches the characters tns:Name> literally (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
<tns:Value>
matches the characters <tns:Value> literally (case sensitive)
1st Capturing Group
([^\<]+)
Match a single character not present in the list below
[^\<]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\< matches the character < with index 6010 (3C16 or 748) 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