Is there a regular expression that can identify whether a string is included in a numbered list?

Struggling with creating a regular expression to determine if a string is part of a numbered list like those in word processors.

Need it to return true only if the string starts with a number, followed by a full stop and a space.

Easy for single or double-digit numbers, but need regex for any size.

Example 1

"1. This is a string"

Should return true as it starts with "1. "

Example 2

"3245. This is another string"

Should also return true starting with "3245. "

Example 3

"This is a 24. string"

Should return false as there's no match at the beginning.

Example 4

"3. This is 24. string"

Still should return true.

Clear? Thanks for your help!

javascriptregex

Answer №1

This regex is quite straightforward. It locates the beginning of the string, followed by one or more digit characters, then a period, and finally a space.

^\d+\.

REY

To test the string in JavaScript, you can use the following code:

var startsWithNumber = /^\d+\. /m.test('34. this should return true.');

jsFiddle

Answer №2

To accomplish this task, you can utilize one of the following regular expressions.

/^\d+\.\s+/ or alternatively /^\d*\.\s*/

Clarification on the functionality of the + and * operators

\d         Represents any digit
\s         Stands for any whitespace character
*          Denotes zero or more occurrences
+          Indicates one or more occurrences

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