So far, the examples seen are considered to find the chapter title that appears anywhere. Any string 'Chapter' after the appearance, follows a space and a number might be a real chapter title, or a cross-reference for other chapters. Since the true chapter title always appears in a row, you need to design a method only to find the title and do not look for cross-reference.
The locator provides this feature. The locator can secure a regular expression to the beginning or end of a row. You can also create a regular expression that only occurs only within words or only at the beginning of words. The following table contains a list of regular expressions and their meaning:
Character Description ^ Matches the start position of the input string. If the multiline property of the regexp object is set, ^ also matches the location after '/ n' or '/ r'. $ Match the end position of the input string. If the multiline property of the Regexp object is set, the $ also matches the position before '/ n' or '/ r'. / b Match a word boundary, that is, the location of the words and spaces. / B matches non-word boundary.
You cannot use a qualifier for the locator. Because there is no plurality of positions in front or rear of the word boundary, such as the expression of '^ *' is not allowed.
To match the text of a line of text, use the '^' characters at the beginning of the regular expression. Don't make the syntax of '^' with their syntax in parentheses. Their syntax is different.
To match the text of a line of text, use the '$' character in the end of the regular expression.
To use the locator when finding the chapter title, the following JScript regular expression will match the beginning of a row at the beginning of a row, the chapter title:
/ ^ Chapter [1-9] [0-9] {0,1} /
The regular expression of the same function in VBScript is as follows:
"^ Chapter [1-9] [0-9] {0,1}"
A true chapter title not only appears in a row, and this line is only this content, so it is inevitably located on a line. The following expression ensures that the specified match matches the chapter without matching cross-reference. It is implemented by creating a regular expression that matches only the start and end position of a line.
/ ^ Chapter [1-9] [0-9] {0,1} $ /
Use VBScript:
"^ Chapter [1-9] [0-9] {0,1} $"
There is a little different from the matching word boundary, but it adds a very important feature to regular expressions. The word boundary is the location between words and spaces. Non-word boundaries are anywhere else. The following JScript expressions will match the first three characters of the word 'Chapter' because they appear after the word boundary:
// bcha /
For VBScript:
"/ bcha"
The location of the '/ b' operator here is critical. If it is located at the beginning of the string to match, the lookup is matched at the beginning of the word; if it is located at the end of the string, the lookup is matched at the end of the word. For example, the following expression will match 'Ter' in the word 'chapter' because it appears before the word boundary:
/ Ter / B /
as well as
"Ter / B"
The following expression will match 'Apt' because it is located in 'Chapter', but does not match 'Apt' in 'Aptitude':
// bapt /
as well as
"/ Bapt"
