What is regular expression for a word

[Hannibal2010]

Dear all,

Now I need a regular expression to describe a specific word.

This word is followed by tab, space, or end of line character.

So I tried it:

my_word[\r\n[^ tab]\+]\*

Now, it can recognize a word follow by a space/tab, but it fails if this word is end of line (it means, it followed by end of line: \r or \n)

Please help me.

[quzah]

If you could phrase your question in the form of a joke, you might have better luck getting a response.

See also: Regular Expressions Reference - Basic Syntax ... I think you want \w


Quzah.

[cas]

$ matches the end of a line, but you can't use it in a bracketed character class (that is, inside of []), so:

my_word([ \t]|$)

That matches my_word, followed by either a space or a tab, or the end of the string. You might instead want:

my_word[ \t\r\n]

This matches my_word followed by either space, tab, \r, or \n.

It all depends on how your regular expression engine matches the end of a line. Often, \n is treated as the end of a line, and $ will thus match it; but this can be changed in some (most?) engines.

[Hannibal2010]

Dear cas,

Thanks for your help.

My way is similar with yours, but it can not recognize the end of string (another cases are okie)

For example:
my_word\n --> cannot find

[Hannibal2010]

I used \b after my_word, it seems be OK

[cas]

\b matches any word boundary (which means anything but [a-zA-Z0-9_]); that's not what you originally asked for. If it works, great, but it's different.

My way is similar with yours, but it can not recognize the end of string (another cases are okie)

I showed you two ways. Both of which work, or at least can work. In the future, I'd recommend giving more information when you're having trouble with something. For example, you could say that you tested both of the versions that I showed you and that neither worked. In addition, you could mention what regular expression library you're using. As things stand, you gave very little information.

[Hannibal2010]

Dear cas,

Maybe my English skill is not good enough, but however, thank you very much for your help