Regular Expressions 101

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/
^(\w+)\s+(\w+)\s*,\s*(\w+).*
/
gmu
^ asserts position at start of a line
1st Capturing Group
(\w+)
\w
match any word character in any script (equivalent to [\p{L}\p{N}_])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\s
matches any kind of invisible character (equivalent to [\p{Z}\h\v])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
2nd Capturing Group
(\w+)
\w
match any word character in any script (equivalent to [\p{L}\p{N}_])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\s
matches any kind of invisible character (equivalent to [\p{Z}\h\v])
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
, matches the character , with index 4410 (2C16 or 548) literally (case sensitive)
\s
matches any kind of invisible character (equivalent to [\p{Z}\h\v])
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
3rd Capturing Group
(\w+)
\w
match any word character in any script (equivalent to [\p{L}\p{N}_])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
.
matches any character, including unicode (except for line terminators)
* matches the previous token between zero 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)
u modifier: unicode. Pattern strings are treated as UTF-16. Also causes escape sequences to match unicode characters
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gmu

Test String

Substitution

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Generated Code

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Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report.
For a full regex reference for AutoIt, please visit: https://www.autoitscript.com/autoit3/docs/functions/StringRegExp.htm