]> color: red; Regex syntax trees Abstract syntax trees for regexes in XSD 1.1 margin-left: 10%; # — No parse. li span li sequence of: li li li one li one or more li zero or more li li ( ) li choice of: li li li Character class: li mce MCE NOT HANDLED. li single-character (escaped) " " li any of li any EXCEPT li li li Subtraction: any li EXCEPT FOR li