A regular expression is used to search for similar words. A regular expression is used to search for words.

A regular expression is used to search for similar words. A regular expression is used to search for words.

This article demonstrates a variety of Regular Expression structures and techniques used in practical applications to familiarize yourself with the application of regular expressions.

Problem description:

In this instance, you need to solve the following problems.

1. You want to find all the color and color in a string.

2. Find any of the three words ending with "at": bat, cat, or rat.

3. Find the word ending with phobia.

4. Common variants of the Target name "Steven": Steve, Steven, and Stephen.

5. All common forms for matching the term "regular expression.

Solution:

The following lists the regular expressions used to solve these problems in sequence. All these solutions use case-insensitive options.

Question 1:Color and color

\ Bcolou? R \ B

Regular option: case insensitive

Regular genre:. NET, Java, JavaScript, PCRE, Perl, Python, Ruby

Question 2:Bat, cat, or rat

\ B [wb] at \ B

Regular option: case insensitive

Question 3:Word ending with "phobia"

\ B \ w * phobia \ B

Regular option: case insensitive

Question 4:Steve, Steven, and Stephen

\ BSte (? : Ven? | Phen) \ B

Question 5:Variation of "regular expression"

\ Breg (? : Ular·Expressions? | Ex (? : Ps? | E [sn])?) \ B

Regular option: case insensitive

Regular genre:. NET, Java, JavaScript, PCRE, Perl, Python, Ruby

Resolution:

\ B # determine the boundary position of a word

Reg # matching "reg"

(? : # Group but not captured

Ular\# Matching "ular"

Expressions? # Match "expression" or "expressions"

| # Or:

Ex # match "ex"

(? : # Group but not captured

Ps? # Match "p" or "ps"

| # Or:

E [sn] # match "es" or "en"

)? # End a non-capturing group. The entire group is optional.

) # End of a non-capturing Group

\ B # determine the boundary position of a word

Note:The five regular expressions use the word boundary (<\ B>) to ensure that only the entire word is matched.

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