This same function can be used for replacing a part of string with the new content. Lets take an example to understand this: usestrict;usewarnings;# This is our original stringmy$str="I know who you are, I will
# string starts with one or more digits /^\d+/ # string that ends with one or more digits /\d+$/ 让我们看看另一个例子 #!/usr/bin/perl $string = "Cats go Catatonic\nWhen given Catnip"; ($start) = ($string =~ /\A(.*?) /); @lines = $string =~ /^(.*?) /gm; print...
#!/usr/bin/perl $string = "The time is: 12:31:02 on 4/12/00"; $string =~ /:\s+/g; ($time) = ($string =~ /\G(\d+:\d+:\d+)/); $string =~ /.+\s+/g; ($date) = ($string =~ m{\G(\d+/\d+/\d+)}); print "Time: $time, Date: $date\n"; 12345678 执...
# string starts with one or more digits /^\d+/ # string that ends with one or more digits /\d+$/ 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 让我们看另一个示例。 #!/usr/bin/perl $string = "Cats go Catatonic\nWhen given Catnip"; ($start) = ($...
# string starts with one or more digits /^\d+/ # string that ends with one or more digits /\d+$/ 让我们看看另一个例子。 #!/usr/bin/perl $string = "Cats go Catatonic\nWhen given Catnip"; ($start) = ($string =~ /\A(.*?) /); ...
Perl contains many built-in functions to work with strings, such aslength,uc,lc, orsubstr. Also, there are third-party modules for working with strings; e.g.String::Util. Perl is widely regarded as the language with the leading support for regular expressions. With regular expressions, we ...
BufferedReader br=null;try{br=newBufferedReader(newFileReader("test.txt"));String line=br.readLine();while(null!=line){if(line.startsWith("http:"))System.out.print(line);line=br.readLine();}}catch(FileNotFoundException e){System.out.println("Can't open file:"+e.getMessage());}catch...
if ($string =~ /^start$/) { print "String starts with 'start'\n"; } 复制代码 匹配任意数字: if ($string =~ /\d+/) { print "String contains digits\n"; } 复制代码 匹配任意字母: if ($string =~ /[a-zA-Z]+/) { print "String contains letters\n"; } 复制代码 匹配邮箱地址...
+/ # string starts with one or more digits /^\d+/ # string that ends with one or more digits /\d+$/ Lets have a look at another example.Open Compiler #!/usr/bin/perl $string = "Cats go Catatonic\nWhen given Catnip"; ($start) = ($string =~ /\A(.*?) /); @lines = $...
If Perl is run with -DL option, then warn()s that start with `!' behave specially. They print a list of categories of memory allocations, and statistics of allocations of different sizes for these categories. If warn() string starts with !!! print changed categories only, print the...