shell bypass 403
module.exports = patternCompile
function patternCompile(pattern) {
var before
var after
if (!pattern._compiled) {
before = pattern.before ? '(?:' + pattern.before + ')' : ''
after = pattern.after ? '(?:' + pattern.after + ')' : ''
if (pattern.atBreak) {
before = '[\\r\\n][\\t ]*' + before
}
pattern._compiled = new RegExp(
(before ? '(' + before + ')' : '') +
(/[|\\{}()[\]^$+*?.-]/.test(pattern.character) ? '\\' : '') +
pattern.character +
(after || ''),
'g'
)
}
return pattern._compiled
}