Deitel - Python, How To Program.pdf

pythonhtp1_29.fm Page 1408 Friday, September 28, 2001 2:18 PM
1408 PHP Chapter 29
27
28 // search for pattern 'Now' at the end of the string
29 if ( ereg( "Now$", $search ) )
30 print( "String 'Now' was found at the end
31 of the line." );
32
33 // search for any word ending in 'ow'
34 if ( ereg( "[[::]]", $search,
35 $match ) )
36 print( "Word found ending in 'ow': " .
37 $match[ 1 ] . "" );
38
39 // search for any words beginning with 't'
40 print( "Words beginning with 't' found: ");
41
42 while ( eregi( "[[::]]",
43 $search, $match ) ) {
44 print( $match[ 1 ] . " " );
45
46 // remove the first occurrence of a word beginning
47 // with 't' to find other instances in the string
48 $search = ereg_replace( $match[ 1 ], "", $search );
49 }
50
51 print( "" );
52 ?>
53
54
Fig. Fig. 29.8 29.8 Using regular expressions (part 2 of 2).
We begin by assigning the string "Now is the time" to variable $search (line
14). Line 19’s condition calls function ereg to search for the literal characters Now inside
variable $search. If the pattern is found, ereg returns true, and line 20 prints a message
indicating that the pattern was found. We use single quotes ('') inside the print
statement to emphasize the search pattern. When located inside a string, content delimited
by single quotes is interpolated. If a print statement uses only single quotes, the content
inside the single quotes is not interpolated. For example,
print( '$name' );
© Copyright 1992–2002 by Deitel & Associates, Inc. All Rights Reserved. 9/28/01