ce4c83ff
 wxy
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var utils = require('../utils')
, nodes = require('../nodes');
var VALID_FLAGS = 'igm';
/**
* retrieves the matches when matching a `val`(string)
* against a `pattern`(regular expression).
*
* Examples:
* $regex = '^(height|width)?([<>=]{1,})(.*)'
*
* match($regex,'height>=sm')
* // => ('height>=sm' 'height' '>=' 'sm')
* // => also truthy
*
* match($regex, 'lorem ipsum')
* // => null
*
* @param {String} pattern
* @param {String|Ident} val
* @param {String|Ident} [flags='']
* @return {String|Null}
* @api public
*/
module.exports = function match(pattern, val, flags){
utils.assertType(pattern, 'string', 'pattern');
utils.assertString(val, 'val');
var re = new RegExp(pattern.val, validateFlags(flags) ? flags.string : '');
return val.string.match(re);
};
function validateFlags(flags) {
flags = flags && flags.string;
if (flags) {
return flags.split('').every(function(flag) {
return ~VALID_FLAGS.indexOf(flag);
});
}
return false;
}
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