#!/bin/sh

set -e
out=$GOROOT/src/regexp/syntax/doc.go
cp syntax.txt $out
sam -d $out <<'!'
,x g/NOT SUPPORTED/d
/^Unicode character class/,$d
,s/[«»]//g
,x g/^Possessive repetitions:/d
,x g/\\C/d
,x g/Flag syntax/d
,s/.=(true|false)/flag &/g
,s/^Flags:/  Flag syntax is xyz (set) or -xyz (clear) or xy-z (set xy, clear z). The flags are:\n/
,s/\n\n\n+/\n\n/g
,x/(^.*	.*\n)+/ | awk -F'	' '{printf("  %-14s %s\n", $1, $2)}'
1,2c
// Copyright 2012 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.

// Code generated by mksyntaxgo from the RE2 distribution. DO NOT EDIT.

/*
Package syntax parses regular expressions into parse trees and compiles
parse trees into programs. Most clients of regular expressions will use the
facilities of package [regexp] (such as [regexp.Compile] and [regexp.Match]) instead of this package.

# Syntax

The regular expression syntax understood by this package when parsing with the [Perl] flag is as follows.
Parts of the syntax can be disabled by passing alternate flags to [Parse].

.
$a
Unicode character classes are those in [unicode.Categories] and [unicode.Scripts].
*/
package syntax
.
w
q
!