E.1 Syntax for regular expressions

JP1/IM - EG for NNMi supports the use of regular expressions. The conventions described below must be observed when you use regular expressions.

Note:: If you use regular expressions, we recommend that you use only the ones presented here, because specification of other regular expressions depends on the computer and OS.

Organization of this subsection

(1) Normal characters
(2) Special characters

(1) Normal characters

Normal characters are those that are evaluated for an exact match when they are specified in a search string. The only characters that are not treated as normal characters are the control codes and special characters.

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(2) Special characters

The following are the special characters: ^ $ . * + ? | ( ) { } [ ] \. The following table explains the special characters.

Table E‒1: Special characters in regular expressions
Special character	Description
`^`	Indicates a beginning specification match (leading-characters match). This is a special character only when it is used at the beginning of a regular expression to denote beginning characters. When this character is used at any other location, it is treated as a normal character.
`$`	Indicates an ending specification match (trailing-characters match). This is a special character only when it is used at the end of a regular expression to denote ending characters. When this character is used at any other location, it is treated as a normal character.
`.` (period)	Indicates any one character.
`*`	Indicates that the immediately preceding character can be included any number of times or no times.
`+`	Indicates that the immediately preceding character is included at least once.
`?`	Indicates that the immediately preceding character is included one time or not at all.
`\|`	Indicates the OR condition between the regular expressions specified before and after the vertical bar. This character is used together with the special characters `(` and `)`.
`(` `)`	Indicates grouping of the enclosed regular expressions. These characters are used mainly in conjunction with the `\|` character.
`{` `}`	Indicates that the immediately preceding character is to be included as many times as the value specified within the curly brackets.
`[` `]`	Indicates that the value includes any of the characters enclosed in the square brackets. If the first character enclosed in the square brackets is the `^`, the value includes any character other than the characters enclosed in the square brackets.
`\`	Escape character. When `\` is specified immediately before a special character, that special character does not perform its function as a special character and instead is treated as a normal character. Note that `\n` is handled as the linefeed character and `\t` is handled as the tab character.

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