# Commands covered:  regexp, regsub
#
# This file contains a collection of tests for one or more of the Tcl
# built-in commands.  Sourcing this file into Tcl runs the tests and
# generates output for errors.  No output means no errors were found.
#
# Copyright (c) 1991-1993 The Regents of the University of California.
# Copyright (c) 1998 Sun Microsystems, Inc.
# Copyright (c) 1998-1999 by Scriptics Corporation.
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
# RCS: @(#) $Id: regexp.test,v 1.13.2.1 2001/04/03 22:54:38 hobbs Exp $

if {[lsearch [namespace children] ::tcltest] == -1} {
    package require tcltest
    namespace import -force ::tcltest::*
}

catch {unset foo}
test regexp-1.1 {basic regexp operation} {
    regexp ab*c abbbc
} 1
test regexp-1.2 {basic regexp operation} {
    regexp ab*c ac
} 1
test regexp-1.3 {basic regexp operation} {
    regexp ab*c ab
} 0
test regexp-1.4 {basic regexp operation} {
    regexp -- -gorp abc-gorpxxx
} 1
test regexp-1.5 {basic regexp operation} {
    regexp {^([^ ]*)[ ]*([^ ]*)} "" a
} 1
test regexp-1.6 {basic regexp operation} {
    list [catch {regexp {} abc} msg] $msg
} {0 1}
test regexp-1.7 {regexp utf compliance} {
    # if not UTF-8 aware, result is "0 1"
    set foo "\u4e4eb q"
    regexp "\u4e4eb q" "a\u4e4eb qw\u5e4e\x4e wq" bar
    list [string compare $foo $bar] [regexp 4 $bar]
} {0 0}

test regexp-2.1 {getting substrings back from regexp} {
    set foo {}
    list [regexp ab*c abbbbc foo] $foo
} {1 abbbbc}
test regexp-2.2 {getting substrings back from regexp} {
    set foo {}
    set f2 {}
    list [regexp a(b*)c abbbbc foo f2] $foo $f2
} {1 abbbbc bbbb}
test regexp-2.3 {getting substrings back from regexp} {
    set foo {}
    set f2 {}
    list [regexp a(b*)(c) abbbbc foo f2] $foo $f2
} {1 abbbbc bbbb}
test regexp-2.4 {getting substrings back from regexp} {
    set foo {}
    set f2 {}
    set f3 {}
    list [regexp a(b*)(c) abbbbc foo f2 f3] $foo $f2 $f3
} {1 abbbbc bbbb c}
test regexp-2.5 {getting substrings back from regexp} {
    set foo {}; set f1 {}; set f2 {}; set f3 {}; set f4 {}; set f5 {};
    set f6 {}; set f7 {}; set f8 {}; set f9 {}; set fa {}; set fb {};
    list [regexp (1*)(2*)(3*)(4*)(5*)(6*)(7*)(8*)(9*)(a*)(b*) \
	      12223345556789999aabbb \
	    foo f1 f2 f3 f4 f5 f6 f7 f8 f9 fa fb] $foo $f1 $f2 $f3 $f4 $f5 \
	    $f6 $f7 $f8 $f9 $fa $fb
} {1 12223345556789999aabbb 1 222 33 4 555 6 7 8 9999 aa bbb}
test regexp-2.6 {getting substrings back from regexp} {
    set foo 2; set f2 2; set f3 2; set f4 2
    list [regexp (a)(b)? xay foo f2 f3 f4] $foo $f2 $f3 $f4
} {1 a a {} {}}
test regexp-2.7 {getting substrings back from regexp} {
    set foo 1; set f2 1; set f3 1; set f4 1
    list [regexp (a)(b)?(c) xacy foo f2 f3 f4] $foo $f2 $f3 $f4
} {1 ac a {} c}
test regexp-2.8 {getting substrings back from regexp} {
    set match {}
    list [regexp {^a*b} aaaab match] $match
} {1 aaaab}

test regexp-3.1 {-indices option to regexp} {
    set foo {}
    list [regexp -indices ab*c abbbbc foo] $foo
} {1 {0 5}}
test regexp-3.2 {-indices option to regexp} {
    set foo {}
    set f2 {}
    list [regexp -indices a(b*)c abbbbc foo f2] $foo $f2
} {1 {0 5} {1 4}}
test regexp-3.3 {-indices option to regexp} {
    set foo {}
    set f2 {}
    list [regexp -indices a(b*)(c) abbbbc foo f2] $foo $f2
} {1 {0 5} {1 4}}
test regexp-3.4 {-indices option to regexp} {
    set foo {}
    set f2 {}
    set f3 {}
    list [regexp -indices a(b*)(c) abbbbc foo f2 f3] $foo $f2 $f3
} {1 {0 5} {1 4} {5 5}}
test regexp-3.5 {-indices option to regexp} {
    set foo {}; set f1 {}; set f2 {}; set f3 {}; set f4 {}; set f5 {};
    set f6 {}; set f7 {}; set f8 {}; set f9 {}
    list [regexp -indices (1*)(2*)(3*)(4*)(5*)(6*)(7*)(8*)(9*) \
	    12223345556789999 \
	    foo f1 f2 f3 f4 f5 f6 f7 f8 f9] $foo $f1 $f2 $f3 $f4 $f5 \
	    $f6 $f7 $f8 $f9
} {1 {0 16} {0 0} {1 3} {4 5} {6 6} {7 9} {10 10} {11 11} {12 12} {13 16}}
test regexp-3.6 {getting substrings back from regexp} {
    set foo 2; set f2 2; set f3 2; set f4 2
    list [regexp -indices (a)(b)? xay foo f2 f3 f4] $foo $f2 $f3 $f4
} {1 {1 1} {1 1} {-1 -1} {-1 -1}}
test regexp-3.7 {getting substrings back from regexp} {
    set foo 1; set f2 1; set f3 1; set f4 1
    list [regexp -indices (a)(b)?(c) xacy foo f2 f3 f4] $foo $f2 $f3 $f4
} {1 {1 2} {1 1} {-1 -1} {2 2}}

test regexp-4.1 {-nocase option to regexp} {
    regexp -nocase foo abcFOo
} 1
test regexp-4.2 {-nocase option to regexp} {
    set f1 22
    set f2 33
    set f3 44
    list [regexp -nocase {a(b*)([xy]*)z} aBbbxYXxxZ22 f1 f2 f3] $f1 $f2 $f3
} {1 aBbbxYXxxZ Bbb xYXxx}
test regexp-4.3 {-nocase option to regexp} {
    regexp -nocase FOo abcFOo
} 1
set x abcdefghijklmnopqrstuvwxyz1234567890
set x $x$x$x$x$x$x$x$x$x$x$x$x
test regexp-4.4 {case conversion in regexp} {
    list [regexp -nocase $x $x foo] $foo
} "1 $x"
catch {unset x}

test regexp-5.1 {exercise cache of compiled expressions} {
    regexp .*a b
    regexp .*b c
    regexp .*c d
    regexp .*d e
    regexp .*e f
    regexp .*a bbba
} 1
test regexp-5.2 {exercise cache of compiled expressions} {
    regexp .*a b
    regexp .*b c
    regexp .*c d
    regexp .*d e
    regexp .*e f
    regexp .*b xxxb
} 1
test regexp-5.3 {exercise cache of compiled expressions} {
    regexp .*a b
    regexp .*b c
    regexp .*c d
    regexp .*d e
    regexp .*e f
    regexp .*c yyyc
} 1
test regexp-5.4 {exercise cache of compiled expressions} {
    regexp .*a b
    regexp .*b c
    regexp .*c d
    regexp .*d e
    regexp .*e f
    regexp .*d 1d
} 1
test regexp-5.5 {exercise cache of compiled expressions} {
    regexp .*a b
    regexp .*b c
    regexp .*c d
    regexp .*d e
    regexp .*e f
    regexp .*e xe
} 1

test regexp-6.1 {regexp errors} {
    list [catch {regexp a} msg] $msg
} {1 {wrong # args: should be "regexp ?switches? exp string ?matchVar? ?subMatchVar subMatchVar ...?"}}
test regexp-6.2 {regexp errors} {
    list [catch {regexp -nocase a} msg] $msg
} {1 {wrong # args: should be "regexp ?switches? exp string ?matchVar? ?subMatchVar subMatchVar ...?"}}
test regexp-6.3 {regexp errors} {
    list [catch {regexp -gorp a} msg] $msg
} {1 {bad switch "-gorp": must be -all, -about, -indices, -inline, -expanded, -line, -linestop, -lineanchor, -nocase, -start, or --}}
test regexp-6.4 {regexp errors} {
    list [catch {regexp a( b} msg] $msg
} {1 {couldn't compile regular expression pattern: parentheses () not balanced}}
test regexp-6.5 {regexp errors} {
    list [catch {regexp a( b} msg] $msg
} {1 {couldn't compile regular expression pattern: parentheses () not balanced}}
test regexp-6.6 {regexp errors} {
    list [catch {regexp a a f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1} msg] $msg
} {0 1}
test regexp-6.7 {regexp errors} {
    list [catch {regexp (x)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.) xyzzy} msg] $msg
} {0 0}
test regexp-6.8 {regexp errors} {
    catch {unset f1}
    set f1 44
    list [catch {regexp abc abc f1(f2)} msg] $msg
} {1 {couldn't set variable "f1(f2)"}}
test regexp-6.9 {regexp errors, -start bad int check} {
    list [catch {regexp -start bogus {^$} {}} msg] $msg
} {1 {expected integer but got "bogus"}}

test regexp-7.1 {basic regsub operation} {
    list [regsub aa+ xaxaaaxaa 111&222 foo] $foo
} {1 xax111aaa222xaa}
test regexp-7.2 {basic regsub operation} {
    list [regsub aa+ aaaxaa &111 foo] $foo
} {1 aaa111xaa}
test regexp-7.3 {basic regsub operation} {
    list [regsub aa+ xaxaaa 111& foo] $foo
} {1 xax111aaa}
test regexp-7.4 {basic regsub operation} {
    list [regsub aa+ aaa 11&2&333 foo] $foo
} {1 11aaa2aaa333}
test regexp-7.5 {basic regsub operation} {
    list [regsub aa+ xaxaaaxaa &2&333 foo] $foo
} {1 xaxaaa2aaa333xaa}
test regexp-7.6 {basic regsub operation} {
    list [regsub aa+ xaxaaaxaa 1&22& foo] $foo
} {1 xax1aaa22aaaxaa}
test regexp-7.7 {basic regsub operation} {
    list [regsub a(a+) xaxaaaxaa {1\122\1} foo] $foo
} {1 xax1aa22aaxaa}
test regexp-7.8 {basic regsub operation} {
    list [regsub a(a+) xaxaaaxaa {1\\\122\1} foo] $foo
} "1 {xax1\\aa22aaxaa}"
test regexp-7.9 {basic regsub operation} {
    list [regsub a(a+) xaxaaaxaa {1\\122\1} foo] $foo
} "1 {xax1\\122aaxaa}"
test regexp-7.10 {basic regsub operation} {
    list [regsub a(a+) xaxaaaxaa {1\\&\1} foo] $foo
} "1 {xax1\\aaaaaxaa}"
test regexp-7.11 {basic regsub operation} {
    list [regsub a(a+) xaxaaaxaa {1\&\1} foo] $foo
} {1 xax1&aaxaa}
test regexp-7.12 {basic regsub operation} {
    list [regsub a(a+) xaxaaaxaa {\1\1\1\1&&} foo] $foo
} {1 xaxaaaaaaaaaaaaaaxaa}
test regexp-7.13 {basic regsub operation} {
    set foo xxx
    list [regsub abc xyz 111 foo] $foo
} {0 xyz}
test regexp-7.14 {basic regsub operation} {
    set foo xxx
    list [regsub ^ xyz "111 " foo] $foo
} {1 {111 xyz}}
test regexp-7.15 {basic regsub operation} {
    set foo xxx
    list [regsub -- -foo abc-foodef "111 " foo] $foo
} {1 {abc111 def}}
test regexp-7.16 {basic regsub operation} {
    set foo xxx
    list [regsub x "" y foo] $foo
} {0 {}}
test regexp-7.17 {regsub utf compliance} {
    # if not UTF-8 aware, result is "0 1"
    set foo "xyz555ijka\u4e4ebpqr"
    regsub a\u4e4eb xyza\u4e4ebijka\u4e4ebpqr 555 bar
    list [string compare $foo $bar] [regexp 4 $bar]
} {0 0}

test regexp-8.1 {case conversion in regsub} {
    list [regsub -nocase a(a+) xaAAaAAay & foo] $foo
} {1 xaAAaAAay}
test regexp-8.2 {case conversion in regsub} {
    list [regsub -nocase a(a+) xaAAaAAay & foo] $foo
} {1 xaAAaAAay}
test regexp-8.3 {case conversion in regsub} {
    set foo 123
    list [regsub a(a+) xaAAaAAay & foo] $foo
} {0 xaAAaAAay}
test regexp-8.4 {case conversion in regsub} {
    set foo 123
    list [regsub -nocase a CaDE b foo] $foo
} {1 CbDE}
test regexp-8.5 {case conversion in regsub} {
    set foo 123
    list [regsub -nocase XYZ CxYzD b foo] $foo
} {1 CbD}
test regexp-8.6 {case conversion in regsub} {
    set x abcdefghijklmnopqrstuvwxyz1234567890
    set x $x$x$x$x$x$x$x$x$x$x$x$x
    set foo 123
    list [regsub -nocase $x $x b foo] $foo
} {1 b}

test regexp-9.1 {-all option to regsub} {
    set foo 86
    list [regsub -all x+ axxxbxxcxdx |&| foo] $foo
} {4 a|xxx|b|xx|c|x|d|x|}
test regexp-9.2 {-all option to regsub} {
    set foo 86
    list [regsub -nocase -all x+ aXxXbxxcXdx |&| foo] $foo
} {4 a|XxX|b|xx|c|X|d|x|}
test regexp-9.3 {-all option to regsub} {
    set foo 86
    list [regsub x+ axxxbxxcxdx |&| foo] $foo
} {1 a|xxx|bxxcxdx}
test regexp-9.4 {-all option to regsub} {
    set foo 86
    list [regsub -all bc axxxbxxcxdx |&| foo] $foo
} {0 axxxbxxcxdx}
test regexp-9.5 {-all option to regsub} {
    set foo xxx
    list [regsub -all node "node node more" yy foo] $foo
} {2 {yy yy more}}
test regexp-9.6 {-all option to regsub} {
    set foo xxx
    list [regsub -all ^ xxx 123 foo] $foo
} {1 123xxx}

test regexp-10.1 {expanded syntax in regsub} {
    set foo xxx
    list [regsub -expanded ". \#comment\n  . \#comment2" abc def foo] $foo
} {1 defc}
test regexp-10.2 {newline sensitivity in regsub} {
    set foo xxx
    list [regsub -line {^a.*b$} "dabc\naxyb\n" 123 foo] $foo
} "1 {dabc\n123\n}"
test regexp-10.3 {newline sensitivity in regsub} {
    set foo xxx
    list [regsub -line {^a.*b$} "dabc\naxyb\nxb" 123 foo] $foo
} "1 {dabc\n123\nxb}"
test regexp-10.4 {partial newline sensitivity in regsub} {
    set foo xxx
    list [regsub -lineanchor {^a.*b$} "da\naxyb\nxb" 123 foo] $foo
} "1 {da\n123}"
test regexp-10.5 {inverse partial newline sensitivity in regsub} {
    set foo xxx
    list [regsub -linestop {a.*b} "da\nbaxyb\nxb" 123 foo] $foo
} "1 {da\nb123\nxb}"

test regexp-11.1 {regsub errors} {
    list [catch {regsub a b c} msg] $msg
} {1 {wrong # args: should be "regsub ?switches? exp string subSpec varName"}}
test regexp-11.2 {regsub errors} {
    list [catch {regsub -nocase a b c} msg] $msg
} {1 {wrong # args: should be "regsub ?switches? exp string subSpec varName"}}
test regexp-11.3 {regsub errors} {
    list [catch {regsub -nocase -all a b c} msg] $msg
} {1 {wrong # args: should be "regsub ?switches? exp string subSpec varName"}}
test regexp-11.4 {regsub errors} {
    list [catch {regsub a b c d e f} msg] $msg
} {1 {wrong # args: should be "regsub ?switches? exp string subSpec varName"}}
test regexp-11.5 {regsub errors} {
    list [catch {regsub -gorp a b c} msg] $msg
} {1 {bad switch "-gorp": must be -all, -nocase, -expanded, -line, -linestop, -lineanchor, -start, or --}}
test regexp-11.6 {regsub errors} {
    list [catch {regsub -nocase a( b c d} msg] $msg
} {1 {couldn't compile regular expression pattern: parentheses () not balanced}}
test regexp-11.7 {regsub errors} {
    catch {unset f1}
    set f1 44
    list [catch {regsub -nocase aaa aaa xxx f1(f2)} msg] $msg
} {1 {couldn't set variable "f1(f2)"}}
test regexp-11.8 {regsub errors, -start bad int check} {
    list [catch {regsub -start bogus pattern string rep var} msg] $msg
} {1 {expected integer but got "bogus"}}

# This test crashes on the Mac unless you increase the Stack Space to about 1
# Meg.  This is probably bigger than most users want... 
# 8.2.3 regexp reduced stack space requirements, but this should be
# tested again
test regexp-12.1 {Tcl_RegExpExec: large number of subexpressions} {macCrash} {
    list [regexp (.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.) abcdefghijklmnopqrstuvwxyz all a b c d e f g h i j k l m n o p q r s t u v w x y z] $all $a $b $c $d $e $f $g $h $i $j $k $l $m $n $o $p $q $r $s $t $u $v $w $x $y $z
} {1 abcdefghijklmnopqrstuvwxyz a b c d e f g h i j k l m n o p q r s t u v w x y z}

test regexp-13.1 {regsub of a very large string} {
    # This test is designed to stress the memory subsystem in order
    # to catch Bug #933.  It only fails if the Tcl memory allocator
    # is in use.

    set line {BEGIN_TABLE ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; END_TABLE}
    set filedata [string repeat $line 200]
    for {set i 1} {$i<10} {incr i} {
	regsub -all "BEGIN_TABLE " $filedata "" newfiledata
    }
    set x done
} {done}

test regexp-14.1 {CompileRegexp: regexp cache} {
    regexp .*a b
    regexp .*b c
    regexp .*c d
    regexp .*d e
    regexp .*e f
    set x .
    append x *a
    regexp $x bbba
} 1
test regexp-14.2 {CompileRegexp: regexp cache, different flags} {
    regexp .*a b
    regexp .*b c
    regexp .*c d
    regexp .*d e
    regexp .*e f
    set x .
    append x *a
    regexp -nocase $x bbba
} 1

# There is no exec on the Mac ...

test regexp-14.3 {CompileRegexp: regexp cache, empty regexp and empty cache} {unixOrPc} {
    makeFile {puts [regexp {} foo]} junk.tcl
    exec $::tcltest::tcltest junk.tcl
} 1

test regexp-15.1 {regexp -start} {
    catch {unset x}
    list [regexp -start -10 {\d} 1abc2de3 x] $x
} {1 1}
test regexp-15.2 {regexp -start} {
    catch {unset x}
    list [regexp -start 2 {\d} 1abc2de3 x] $x
} {1 2}
test regexp-15.3 {regexp -start} {
    catch {unset x}
    list [regexp -start 4 {\d} 1abc2de3 x] $x
} {1 2}
test regexp-15.4 {regexp -start} {
    catch {unset x}
    list [regexp -start 5 {\d} 1abc2de3 x] $x
} {1 3}
test regexp-15.5 {regexp -start, over end of string} {
    catch {unset x}
    list [regexp -start [string length 1abc2de3] {\d} 1abc2de3 x] [info exists x]
} {0 0}
test regexp-15.6 {regexp -start, loss of ^$ behavior} {
    list [regexp -start 2 {^$} {}]
} {0}

test regexp-16.1 {regsub -start} {
    catch {unset x}
    list [regsub -all -start 2 {\d} a1b2c3d4e5 {/&} x] $x
} {4 a1b/2c/3d/4e/5}
test regexp-16.2 {regsub -start} {
    catch {unset x}
    list [regsub -all -start -25 {z} hello {/&} x] $x
} {0 hello}
test regexp-16.3 {regsub -start} {
    catch {unset x}
    list [regsub -all -start 3 {z} hello {/&} x] $x
} {0 hello}
test regexp-16.4 {regsub -start, \A behavior} {
    set out {}
    lappend out [regsub -start 0 -all {\A(\w)} {abcde} {/\1} x] $x
    lappend out [regsub -start 2 -all {\A(\w)} {abcde} {/\1} x] $x
} {5 /a/b/c/d/e 3 ab/c/d/e}

test regexp-17.1 {regexp -inline} {
    regexp -inline b ababa
} {b}
test regexp-17.2 {regexp -inline} {
    regexp -inline (b) ababa
} {b b}
test regexp-17.3 {regexp -inline -indices} {
    regexp -inline -indices (b) ababa
} {{1 1} {1 1}}
test regexp-17.4 {regexp -inline} {
    regexp -inline {\w(\d+)\w} "   hello 23 there456def "
} {e456d 456}
test regexp-17.5 {regexp -inline no matches} {
    regexp -inline {\w(\d+)\w} ""
} {}
test regexp-17.6 {regexp -inline no matches} {
    regexp -inline hello goodbye
} {}
test regexp-17.7 {regexp -inline, no matchvars allowed} {
    list [catch {regexp -inline b abc match} msg] $msg
} {1 {regexp match variables not allowed when using -inline}}

test regexp-18.1 {regexp -all} {
    regexp -all b bbbbb
} {5}
test regexp-18.2 {regexp -all} {
    regexp -all b abababbabaaaaaaaaaab
} {6}
test regexp-18.3 {regexp -all -inline} {
    regexp -all -inline b abababbabaaaaaaaaaab
} {b b b b b b}
test regexp-18.4 {regexp -all -inline} {
    regexp -all -inline {\w(\w)} abcdefg
} {ab b cd d ef f}
test regexp-18.5 {regexp -all -inline} {
    regexp -all -inline {\w(\w)$} abcdefg
} {fg g}
test regexp-18.6 {regexp -all -inline} {
    regexp -all -inline {\d+} 10:20:30:40
} {10 20 30 40}
test regexp-18.7 {regexp -all -inline} {
    list [catch {regexp -all -inline b abc match} msg] $msg
} {1 {regexp match variables not allowed when using -inline}}
test regexp-18.8 {regexp -all} {
    # This should not cause an infinite loop
    regexp -all -inline {a*} a
} {a}
test regexp-18.9 {regexp -all} {
    # Yes, the expected result is {a {}}.  Here's why:
    # Start at index 0; a* matches the "a" there then stops.
    # Go to index 1; a* matches the lambda (or {}) there then stops.  Recall
    #   that a* matches zero or more "a"'s; thus it matches the string "b", as
    #   there are zero or more "a"'s there.
    # Go to index 2; this is past the end of the string, so stop.
    regexp -all -inline {a*} ab
} {a {}}
test regexp-18.10 {regexp -all} {
    # Yes, the expected result is {a {} a}.  Here's why:
    # Start at index 0; a* matches the "a" there then stops.
    # Go to index 1; a* matches the lambda (or {}) there then stops.   Recall
    #   that a* matches zero or more "a"'s; thus it matches the string "b", as
    #   there are zero or more "a"'s there.
    # Go to index 2; a* matches the "a" there then stops.
    # Go to index 3; this is past the end of the string, so stop.
    regexp -all -inline {a*} aba
} {a {} a}
test regexp-18.11 {regexp -all} {
    regexp -all -inline {^a} aaaa
} {a}

test regexp-19.1 {regsub null replacement} {
    regsub -all {@} {@hel@lo@} "\0a\0" result
    list $result [string length $result]
} "\0a\0hel\0a\0lo\0a\0 14"

# cleanup
::tcltest::cleanupTests
return