Use the following format for survey questions pattern validators.

Genericbaseofcustomvalidatorsthatmatchagainstapattern

WetrytoblendideasfromGREPandjava.text.Formattoenable

thepatternmatch:

0-matchadecimaldigit

a-matchanalphabetic

n-matchanalphanumeric

x-matchanysinglecharacter

w-matchwhitespace

f-matchanylengthoffillerbeforetheNEXTpattern

.-matchEOS

\x-matchtheescapedliteralcharacter'x'

'x'-matchtheexcapedliteralcharacter'x'

X*-match0ormore

X+-match1ormore

X?-match0or1

X!-forcenon-optional,singlematch(typicallyforoutboundliterals)

X^-match1andskipit(noemit)

[......]-matchaphrase