string - two asterisk sttring match in TCL -

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help me decide 1 problem in tcl. using macros want find string, contains 2 asterisk (**). tried used following commands:

string match \*\* string_name

but doesn't work. can explain me made mistake , how correctly?

thanks in advance!

what passing interpreter string match ** string_name. need pass actual backslashes interpreter understand 2 escaped asterisks, , need add couple more backslashes:

string match \\*\\* $s

or use braces:

string match {\*\*} $s

note above match only if $s contains 2 asterisks, , nothing else. allow before , after asterisks, can use more asterisks...

string match {*\*\**} $s

there few other ways check if string has double asterisks, can instance use string first (and since 1 not support expressions, can away without having escape anything):

string first ** $s

if greater -1, ** present in $s.

or if happen know regular expressions:

regexp -- {\*\*} $s

those common think.


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