How to use regular expressions to find similar words
This article will explain in detail how to use regular expressions to find similar words. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.
Problem description:
In this example, you have to solve the following problems.
1. Want to find all the color and colour in a string.
2. Want to find any of the three words that end with "at": bat, cat, or rat.
3. Want to find the word that ends in phobia.
4. Common variants of the name "Steven" you are looking for: Steve, Steven, and Stephen.
5. Want to match all the common forms of the term "regular expression".
Solution:
The regular expressions used to solve these problems are listed in order below. Case-insensitive options are used in all of these solutions.
Question 1:color and colour
\ bcolou?r\ b
Regular option: case-insensitive
Regular schools: .NET, Java, JavaScript, PCRE, Perl, Python, Ruby
Question 2:bat, cat, or rat
\ b [BCR] at\ b
Regular option: case-insensitive
Question 3: words ending in "phobia"
\ b\ w*phobia\ b
Regular option: case-insensitive
Questions 4:Steve, Steven and Stephen
\ bSte (?: ven? | phen)\ b
Question 5: variants of "regular expression"
\ breg (?: ular ·expressions? | ex (?: ps? | e [sn])?)\ b
Regular option: case-insensitive
Regular schools: .NET, Java, JavaScript, PCRE, Perl, Python, Ruby
Parsing:
\ b # determine the boundary position of a word
Reg # matches "reg"
(?: # grouped but not captured
Ular\ # matches "ular"
Expressions? # matches "expression" or "expressions"
| # or:
Ex # matches "ex"
(?: # grouped but not captured
Ps? # matches "p" or "ps"
| # or:
E [sn] # matches "es" or "en"
)? # end the non-capture packet, and the whole packet is optional
) # end of non-capture packet
\ b # determine the boundary position of a word
Note: all five regular expressions use word boundaries () to ensure that only the entire word is matched.
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