ular
expression from the <I>patObj</I>.  If the value does not already
contain a compiled regular expression it will attempt to create one
from the string in the value and assign it to the internal
representation of the <I>patObj</I>.  The return value of this function
is of type <B>Tcl_RegExp</B>.  The return value is a token for this
compiled form, which can be used in subsequent calls to
<B>Tcl_RegExpExecObj</B> or <B>Tcl_RegExpGetInfo</B>.  If an error
occurs while compiling the regular expression then
