Regex for string with number using node.js

Question

I am using replace string using regex.

How will i find the following string with decimal number.

 Section 5.1.1
 Sections 5.1.2
 Sections 5.1.3 and 5.1.4
 Sec. 5.3.1

Can any one assist me?

Thanks in advance.

Updated:

 (Sec(?:s\.|s|tions|tion|.)?)(&#xA0;|\s)?((\w+)?([.-]|(&#x2013;)|(&#x2014;))?(\w+))(\s+)?((\w+)?([.-]|(&#x2013;)|(&#x2014;))?(\w+))(\s+(to|and|through)\s(\w+)([.-]|(&#x2013;)|(&#x2014;))(\w+))?

It depends on what you don't want to match, too... Should "Sect 666" be matched for example ? — Denys Séguret
– Denys Séguret, Commented Jun 17, 2015 at 12:14
This big regex isn't made only for the cases you show. What's the problem with it ? — Denys Séguret
– Denys Séguret, Commented Jun 17, 2015 at 12:20

x-ray · Accepted Answer · 2015-06-17 15:28:49Z

2

How about

/(^|\s)(Sec\.|Sections?) +[0-9]+(\.[0-9]+)*( +and +[0-9]+(\.[0-9]+)*)*(?=$|\s)/

It will match substrings that

begin with whitespace or are at the beginning of the searched string
are followed by whitespace or are at the end of the searched string
start with Sec., Section or Sections
followed by one or more spaces
followed by a section number
optionally followed by one or more and [section number], where and is surrounded by one or more spaces.

Section numbers match if they

start with one or more digits
optionally followed one or more times by a dot and again one or more digits.

You can trim the match to get rid of eventual whitespace at the beginning of the match.

Update

/(^|[^\w])(Sec\.|Sections?) +[0-9]+(\.[0-9]+)*( +and +[0-9]+(\.[0-9]+)*)*(?=$|[^\w])/

This one matches substrings that

begin with a non-word character or are at the beginning of the searched string
are followed by a non-word character or are at the end of the searched string

Rest same as above. Use an additional replace on the match to get rid of non-word character matches at the beginning: match.replace(/^[^\w]+/, '')

edited Jun 17, 2015 at 15:28

answered Jun 17, 2015 at 13:36

x-ray

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2 Comments

Vanarajan Over a year ago

It is working fine. But if there is dot or comma at the end of the section. The match is not found. If i have dot or comma at the end of the section string, how will handle?

x-ray Over a year ago

See updated answer. Please upvote/accept answer if it's what you were looking for.

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