Regular Expressions 101

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/
^From:\s[A-Za-z]\s[A-Za-z](\s[A-Za-z])?(\s[A-Za-z])?\s<[A-Za-z]@osh\.co\.za>
/
gm
^ asserts position at start of a line
From: matches the characters From: literally (case sensitive)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
Match a single character present in the list below
[A-Za-z]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
A-Z matches a single character in the range between A (index 65) and Z (index 90) (case sensitive)
a-z matches a single character in the range between a (index 97) and z (index 122) (case sensitive)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
Match a single character present in the list below
[A-Za-z]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
A-Z matches a single character in the range between A (index 65) and Z (index 90) (case sensitive)
a-z matches a single character in the range between a (index 97) and z (index 122) (case sensitive)
1st Capturing Group
(\s[A-Za-z])?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
Match a single character present in the list below
[A-Za-z]
2nd Capturing Group
(\s[A-Za-z])?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
Match a single character present in the list below
[A-Za-z]
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
< matches the character < literally (case sensitive)
Match a single character present in the list below
[A-Za-z]
@osh matches the characters @osh literally (case sensitive)
\. matches the character . literally (case sensitive)
co matches the characters co literally (case sensitive)
\. matches the character . literally (case sensitive)
za> matches the characters za> 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