Regular Expressions. Note: The contents of this topic is adapted from documentation provided by Trolltech.We need (caret) which when it is the first character in the regexp means that the regexp must match from the beginning of the string. EditPlus supports Regular Expressions in search and replace, but its engine is not as feature-rich as others. A list of common regular expression features not available in EditPlus is available here. Please see Regular Expressions for some commonly used examples. . escape (In fact, I knew so little about this space that when a friend referred to Regular Expressions as RegEx, I wondered what he was talking about.)A dollar sign means dont match if the target string has any characters beyond where I have placed the dollar sign in my Regular Expression. The flag /g of regular expressions. Sometimes, a regular expression should match the same string multiple times.RegExp.prototype.test(): determining whether there is a match. Regular expressions have the method. In search mode by patterns, the search key describes the primary keys of the entries to select by means of a regular expression pattern.