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regexp: allow escaping of any punctuation

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More in line with other regexp packages
and egrep; accommodates overzealous escapers.

R=r
CC=golang-dev
https://golang.org/cl/1008041
This commit is contained in:
Russ Cox 2010-04-26 10:00:18 -07:00
parent 43409ed2c6
commit 6f33f34bbc
2 changed files with 13 additions and 4 deletions
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9
src/pkg/regexp/all_test.go
View File

@ -28,6 +28,7 @@ var good_re = []string{
`[abc]`,
`[^1234]`,
`[^\n]`,
`\!\\`,
}
type stringError struct {
@ -100,6 +101,14 @@ var matches = []tester{
// fixed bugs
tester{`ab$`, "cab", vec{1, 3}},
tester{`axxb$`, "axxcb", vec{}},
// can backslash-escape any punctuation
tester{`\!\"\#\$\%\&\'\(\)\*\+\,\-\.\/\:\;\<\=\>\?\@\[\\\]\^\_\{\|\}\~`,
`!"#$%&'()*+,-./:;<=>?@[\]^_{|}~`, vec{0, 31}},
tester{`[\!\"\#\$\%\&\'\(\)\*\+\,\-\.\/\:\;\<\=\>\?\@\[\\\]\^\_\{\|\}\~]+`,
`!"#$%&'()*+,-./:;<=>?@[\]^_{|}~`, vec{0, 31}},
tester{"\\`", "`", vec{0, 1}},
tester{"[\\`]+", "`", vec{0, 1}},
}
func compileTest(t *testing.T, expr string, error os.Error) *Regexp {

8
src/pkg/regexp/regexp.go
View File

@ -298,8 +298,8 @@ func special(c int) bool {
return false
}
func specialcclass(c int) bool {
for _, r := range `\-[]` {
func ispunct(c int) bool {
for _, r := range "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~" {
if c == r {
return true
}
@ -344,7 +344,7 @@ func (p *parser) charClass() instr {
p.error(ErrExtraneousBackslash)
case c == 'n':
c = '\n'
case specialcclass(c):
case ispunct(c):
// c is as delivered
default:
p.error(ErrBadBackslash)
@ -439,7 +439,7 @@ func (p *parser) term() (start, end instr) {
p.error(ErrExtraneousBackslash)
case c == 'n':
c = '\n'
case special(c):
case ispunct(c):
// c is as delivered
default:
p.error(ErrBadBackslash)