set a {data arrival time data arrival data arrival time data arrival data arrival time}
set RE {data arrival}
set match [regexp -all -inline $RE $a]
puts $match
c2V0IGEge2RhdGEgYXJyaXZhbCB0aW1lIGRhdGEgYXJyaXZhbCBkYXRhIGFycml2YWwgdGltZSBkYXRhIGFycml2YWwgZGF0YSBhcnJpdmFsIHRpbWV9CnNldCBSRSB7ZGF0YSBhcnJpdmFsfQpzZXQgbWF0Y2ggW3JlZ2V4cCAtYWxsIC1pbmxpbmUgJFJFICRhXQpwdXRzICRtYXRjaA==