Dictionary - Custom Dictionaries

Custom dictionaries are used to store standard terms, synonyms, and regular expressions for general vocabulary.

Standard Terms

Standard terms include individual words and synonyms used for table queries or specific words that need to be covered.

For example:

If you want to include a beverage that is not covered by the system's built-in dictionary, you can add the beverage name "tea" and include its corresponding synonyms to maintain its dictionary content.

Regular Expressions

Regular expressions are powerful text processing tools used to search, match, and manipulate text patterns. They consist of a series of special characters and metacharacters used to define the text pattern to be matched.

Here are some common metacharacters used in regular expressions:

Character Matching:

• .：Matches any single character except a newline.
• \w：Matches any letter, digit, or underscore.
• \d：Matches any digit character.
• \s：Matches any whitespace character, such as space or tab.

Repetition Matching:

• *：Matches the preceding element zero or more times.
• +：Matches the preceding element one or more times.
• ?：Matches the preceding element zero or one time.
• {n}：Matches the preceding element exactly n times.
• {n,}：Matches the preceding element at least n times.
• {n,m}：Matches the preceding element at least n times but not more than m times.

Character Classes:

• [abc]：Matches any one of the characters a, b, or c.
• [^abc]：Matches any character except a, b, or c.
• [0-9]：Matches any digit character.
• [a-zA-Z]：Matches any alphabetic character.

Anchors:

• ^：Matches the start of the text.
• $：Matches the end of the text.
• \b：Matches a word boundary.

Usage

For example:

If you need a dictionary for email addresses, which cannot be represented by a single word, you can use the following regular expression to extract email addresses.

^\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$

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