IARPA/Pattern

Regex Expressions:

• alternation: |
• option: ?
• Kleene-star: *
• plus: +
• start assertion: ^
• end assertion: $
• matching group: ()
• non-matching group: (?:)
• named group: (<name>:)

Token Expressions:

• string: takes a case-insensitive regular expression
• stringcs: take a case-sensitive regular expression
• lemma: take a case-insensitive regular expression for the lemma
• pos: takes a case-insensitive regular expression for the pos tag
• chunk: takes a case-insensitive regular expression for the chunk tag
• type: takes a case-insensitive string for any type that spans the token

Examples:

 <string="an?|the">? <pos="JJ">* <pos="NNP">+ <pos="NN">+ <pos="NNP>+
 The incredible U.S. president Barack Obama
 famed UW professor Oren Etzioni

 <pos="NNP">+ <stringcs="president">+ <pos="NNP>+
 U.S. president Barack Obama
 not: U.S. President Barack Obama