tcl how to split a string by using regexp

Question

I have some string with format

class(amber#good)
class(Back1#notgood)
class(back#good)

and I want to use regexp to get value of these string

Expected answer:

amber
Back1
back

And here's my cmd:

set string "class(amber#good)"
regexp -all {^\\([a-zA-z_0-9].\#$} $string $match
puts $match

But the answer is not what I expected

Answer 1

You can use

regexp {\(([^()#]+)} $string - match

See the Tcl demo online .

The \(([^()#]+) regex matches

• \( - a ( char
• ([^()#]+) - Capturing group 1 ( match ): any one or more chars other than parentheses and # .

The hyphen is used since the whole-match value is not necessary, we are only interested to get Group 1 value.

Answer 2

Sometimes using regular expressions is error prone and/or overkill.

Here's an alternate answer using split:

lindex [split $string "()#"] 1