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<script>
var s = "iaa1234 a234m is a44by tam iaa1234 a234m is a44by tam";
var pattern = /a(\d+)m|a(\d+)b/g;
var res = "";
while (pattern.exec(s) != null) {
res += RegExp.$1 + "-"+ RegExp.$2 +"\n";
}
alert(res);
</script>
var s = "iaa1234 a234m is a44by tam iaa1234 a234m is a44by tam";
var pattern = /a(\d+)m.*?a(\d+)b/g;
var res = "";
while(pattern.exec(s) != null) {
res += RegExp.$1 + "-" + RegExp.$2 + "\n";
}
alert(res);