Regular Expressions 101

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/
^[\p{Arabic} ]$
/
gmu
^ asserts position at start of a line
Match a single character present in the list below
[\p{Arabic} ]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\p{Arabic} matches any characters in the Arabic script
matches the character literally (case sensitive)
$ asserts position at the end of a line
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