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PHP reg expression question
blaketar

10+ Year Member



 
Msg#: 3635475 posted 10:44 pm on Apr 25, 2008 (gmt 0)

Simple question, what is the most efficient way to search for whole words in a string?

For example if I have two strings:

1.) This is the way to the lake.
2.) It was always like this.

When I search for the word "is" only the 1st string should match. My current script returns the second string also because it has "this" or i and s in the sequence.

 

cameraman

WebmasterWorld Senior Member 5+ Year Member



 
Msg#: 3635475 posted 11:11 pm on Apr 25, 2008 (gmt 0)

I wouldn't be surprised if there were a better way, but this looks to be working:
#(^is)¦(\sis\s)¦(\sis$)#i

coopster

WebmasterWorld Administrator coopster us a WebmasterWorld Top Contributor of All Time 10+ Year Member



 
Msg#: 3635475 posted 4:26 pm on Apr 26, 2008 (gmt 0)

You could use a word boundary [php.net].

g1smd

WebmasterWorld Senior Member g1smd us a WebmasterWorld Top Contributor of All Time 10+ Year Member



 
Msg#: 3635475 posted 7:41 pm on Apr 26, 2008 (gmt 0)

This would work:

((^is(\ \,\.))(\ is(\ \,\.)))

- Begins with the word and is then followed by a space, comma or period.
- Has a space before, and a space, or comma, or period directly after.

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