Assertion: expression's meaning | /r/HasProperty | the backslash
Facets:
Source sentences:
text: Twelve characters have special meanings in regular expressions: the backslash \ , the caret ^ , the dollar sign $ , the period or dot . , the vertical bar or pipe symbol | , the question mark ? , the asterisk or star * , the plus sign + , the opening parenthesis ( , the closing parenthesis ) , the opening square bracket [ , and the opening curly brace { .