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// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package regexp implements a simple regular expression library.
// QuoteMeta func is copied here to avoid linking the entire Regexp library.
package rubex
func special(c int) bool {
for _, r := range `\.+*?()|[]^$` {
if c == int(r) {
return true
}
}
return false
}
// QuoteMeta returns a string that quotes all regular expression metacharacters
// inside the argument text; the returned string is a regular expression matching
// the literal text. For example, QuoteMeta(`[foo]`) returns `\[foo\]`.
func QuoteMeta(s string) string {
b := make([]byte, 2*len(s))
// A byte loop is correct because all metacharacters are ASCII.
j := 0
for i := 0; i < len(s); i++ {
if special(int(s[i])) {
b[j] = '\\'
j++
}
b[j] = s[i]
j++
}
return string(b[0:j])
}
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