Match Pattern not wrking with character "["

[OnlyOne]

Hello,
i have an input text where i want to do a pattern match for charcter "[", but this character is ignored and i get the full input text.
But the character "]" is working.
What do i have to do to make it work?
Thx

See attached vi for example of my problem.

[chilly_charly]

The "[" character is used as a separator in the syntax of the Match Pattern function.

Replace it with a \[ in the Regular Expression field. (Have a look at the online Help, and click Detailled Help)

[OnlyOne]

Hi chilly,
thanks for your help. This works.

But what happens if i want to search for pattern "\[" in the input string?

Input: Start \[Info] End
regular expression: \[

[tst]

---

OnlyOne wrote:

But what happens if i want to search for pattern "\[" in the input string?

---

\ is also a special character, so you need to escape it as well. The expression should be \\\[

[chilly_charly]

---

OnlyOne a écrit:
But what happens if i want to search for pattern "\[" in the input string?

Input: Start \[Info] End
regular expression: \[

---

The basic idea is to put an antislash "\" before any character used as a syntax symbol.

Accordingly, to  search for " \[", use "\\\[ "

BTW, this is also valid for the ] character !

[OnlyOne]

>BTW, this is also valid for the ] character !

But the ] character is working in my example (first posting) without the \.

[_Bryan]

When I had this problem I used Ascii hex codes.  But it is good to find other ways, especially when they are easier.

\5C = \

\5B = [

\5D = ]

Message Edited by _Bryan on 11-08-2007 01:11 PM

[chilly_charly]

---

OnlyOne a écrit: ... But the ] character is working in my example (first posting) without the \.

---

I know. This is because the ] char is a closing symbol, and LabVIEW is smart enough not to properly interpret the search string. But it shouldn't harm you be rigorous 😉