MED: Regular expression searching for lookup searches

Full regular expression searching is available on lookup searches for those who wish to do sophisticated search manipulations. Full regular expression searching makes extensive use of wild card characters.

For example:

tak "tak" anywhere in the form stak, stakeren, tak, taket, thistel-tak, etc.
^tak$ the beginning of a form, followed by "tak", and the end of the form tak
tak$ "tak" at the end of a form psitak, stak, tak, thistel-tak
t[aeiou]k "tak", "tek", "tik", "tok", "tuk", anywhere in a form paletik, pot-stikke, puttok, reumatik, etc.
tr(ai|ea|ee|ou)n "train", "trean", "treen", or "troun" anywhere in a form quistro hacekun, traine, tre macronen, etc.
t.*aunce "t" followed by zero or more of any character then "aunce" anywhere in a form pastaunce, repentauncer, staunce, trauncen, etc.
th.+d "th" followed by one or more characters, then a "d" anywhere in a form spothed, thenneward, therfed, thrudden, etc.
th.?g "th" followed by one or zero characters, then a "g" prothogol, thiggen, thogth, etc.

Combinations of these above are also possible:

^tr[aeiou]+t$ "tr" followed by one or more of any of a, e, i, o, or u, and then t, as the complete form (anchored at beginning and end) trait, trot, tro hacekut,
qu(e)*(n)+ "qu" followed by zero or more "e" followed by one or more "n" anywhere in a form persequent, quench, que macronne, squenchen, etc.
m(ai|ae|a|e)ne?$ words ending in "m" followed by one of "ai", "ae", "a", or "e", followed by "n", followed by zero or one "e" permain, Pigmaine, regimen, spatimene, travailinge-man, etc.

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