Regular Expressions 101

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/
([A-z0-9\s]{1,11})(\s)(.*)
/
1st Capturing Group
([A-z0-9\s]{1,11})
Match a single character present in the list below
[A-z0-9\s]{1,11}
{1,11} Quantifier — Matches between 1 and 11 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 122) (case sensitive)
0-9 a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)
\s matches any whitespace character (equal to [\r\n\t\f\v ])
2nd Capturing Group
(\s)
\s matches any whitespace character (equal to [\r\n\t\f\v ])
3rd Capturing Group
(.*)
.*
matches any character (except for line terminators)
* Quantifier — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/

Test String

Substitution

Processing...