V2 scripts, add new features.
1. Add help info
2. Can print context of matched text

Note:
For performance issue, this scripts cannot print the line number of
matched text. User has to open file he is interested to continues
searching.
V2 script, add some new features
1. Add more help info
2. Support print context of matched text in file

Note:
For performance issue, this script cannot print the line number of matched
text located in files. User has to open file he is interested to continues
searching.