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@rsc rsc gofmt 8ce09df Feb 23, 2012
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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package regexp implements regular expression search tuned for
// use in grep-like programs.
package regexp
import "regexp/syntax"
func bug() {
panic("codesearch/regexp: internal error")
}
// Regexp is the representation of a compiled regular expression.
// A Regexp is NOT SAFE for concurrent use by multiple goroutines.
type Regexp struct {
Syntax *syntax.Regexp
expr string // original expression
m matcher
}
// String returns the source text used to compile the regular expression.
func (re *Regexp) String() string {
return re.expr
}
// Compile parses a regular expression and returns, if successful,
// a Regexp object that can be used to match against lines of text.
func Compile(expr string) (*Regexp, error) {
re, err := syntax.Parse(expr, syntax.Perl)
if err != nil {
return nil, err
}
sre := re.Simplify()
prog, err := syntax.Compile(sre)
if err != nil {
return nil, err
}
if err := toByteProg(prog); err != nil {
return nil, err
}
r := &Regexp{
Syntax: re,
expr: expr,
}
if err := r.m.init(prog); err != nil {
return nil, err
}
return r, nil
}
func (r *Regexp) Match(b []byte, beginText, endText bool) (end int) {
return r.m.match(b, beginText, endText)
}
func (r *Regexp) MatchString(s string, beginText, endText bool) (end int) {
return r.m.matchString(s, beginText, endText)
}
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