The following regex will match what you are after:
/AL|Alabama|AK|Alaska|AZ|Arizona|AR|Arkansas|CA|California|CO|Colorado|CT|Connecticut|DE|Delaware|FL|Florida|GA|Georgia|HI|Hawaii|ID|Idaho|IL|Illinois|IN|Indiana|IA|Iowa|KS|Kansas|KY|Kentucky|LA|Louisiana|ME|Maine|MD|Maryland|MA|Massachusetts|MI|Michigan|MN|Minnesota|MS|Mississippi|MO|Missouri|MT|Montana|NE|Nebraska|NV|Nevada|NH|New Hampshire|NJ|New Jersey|NM|New Mexico|NY|New York|NC|North Carolina|ND|North Dakota|OH|Ohio|OK|Oklahoma|OR|Oregon|PA|Pennsylvania|RI|Rhode Island|SC|South Carolina|SD|South Dakota|TN|Tennessee|TX|Texas|UT|Utah|VT|Vermont|VA|Virginia|WA|Washington|WV|West Virginia|WI|Wisconsin|WY|Wyoming/
I would not recommend it (according to the comments above), but it will do the trick. It contains the names of all 50 states, as well as their abbreviations, separated by a symbol or. Thus, it will match any of them. You may consider adding word boundaries, etc.
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