Regular Expressions 101

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/
\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}\b
/
gm
\b assert position at a word boundary: (^\\w|\\w$|\\W\\w|\\w\\W)
Match a single character present in the list below
[A-Za-z0-9._%+-]+
+ Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)
A-Z a single character in the range between A (index 65) and Z (index 90) (case sensitive)
a-z a single character in the range between a (index 97) and z (index 122) (case sensitive)
0-9 a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)
._%+- matches a single character in the list ._%+- (case sensitive)
@ matches the character @ literally (case sensitive)
Match a single character present in the list below
[A-Za-z0-9.-]+
+ Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)
A-Z a single character in the range between A (index 65) and Z (index 90) (case sensitive)
a-z a single character in the range between a (index 97) and z (index 122) (case sensitive)
0-9 a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)
.- matches a single character in the list .- (case sensitive)
\. matches the character . literally (case sensitive)
Match a single character present in the list below
[A-Za-z]{2,4}
{2,4} Quantifier — Matches between 2 and 4 times, as many times as possible, giving back as needed (greedy)
A-Z a single character in the range between A (index 65) and Z (index 90) (case sensitive)
a-z a single character in the range between a (index 97) and z (index 122) (case sensitive)
\b assert position at a word boundary: (^\\w|\\w$|\\W\\w|\\w\\W)
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