1. Perl

2. Perl Regular Expressions

3. Perl Regular Expressions

4. Perl Regular Expressions

5. Perl Regular Expressions

6. Perl Regular Expressions

7. Perl Regular Expressions

8. Perl Regular Expressions Pattern Matching Modifiers /g – match all occurrences /i– Do case-insensitive pattern matching /m – Treat string as multiple lines. /o – compile pattern only once /s - Treat string as single line Let . Match a new line /x –Use extended regular expressions Ignore most white space and permits comments in pattern Mostly used in the above is /g and /i only

9. Perl Files Open a file Open (DATA, “<numbers.dat”); Close a file Close DATA Print to a file Print DATA “Hello Welcome”; Here DATA is the file handle, < - indicates File Read > - indicates File Write and >> indicates file Append