LAE

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Originally posted by: dstacey

Hi,

Is there a simple way of capitalizing certain letters using regexSubsitute?

As an example if I create a string how can I capitilize the first letter and swap its position with the second character?

e.g.
x = "abcdef"
y = regexSubstitute(x,"(.)(.)","$2$1",1) #swaps the letters over
z = regexSubstitute(x,"(.)(.)","$2\u$1",1) #I thought using \u would work but it throws an invalid escape sequence error

Any help anyone can give me on this is much appreciated - in general is there a document or graph that lists all the special character support and/or some more examples?

Thanks
Dave

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Originally posted by: andycooper

Hi Dave,

I've attached a cheat sheet I have for RegEx and below are some useful links: -

regular-expressions-cheat-sheet-v1.pdf

http://pcre.org/

https://www.cs.tut.fi/~jkorpela/perl/regexp.html

If you need any more details please let me know.

Ta

Andy

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Originally posted by: dstacey

Hi Andy,

Thanks the cheat sheets will help me a lot. I still couldn't see how to capitalize a letter in my substitution though so if anyone knows how to do that it would be very helpful (\u and \l seem to be valid in Perl but not in Brainscript)

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Originally posted by: mlam

Hi dstacey,

I've attached a couple of examples and I hope they help:

• Dummy input 1 - I've used your example input here. In the filter node, I use the "toUpper" function to set the first letter to uppercase prior to using regex to swap the characters
• Dummy input 2 - This is an example where I may have multiple cases in my input where I want to make a replacement. I use the regexMatchI function to find matches and then loop through to substitute. I've got two examples here that effectively do the same thing - the first one sets characters to capitals within a list via the "map" function and the second uses the "toUpper" function from above.

Example graph: regexexample.brg

In addition to the links Andy has provided above, I also find the Wikipedia page to be quite useful!: http://en.wikipedia.org/wiki/Regular_expression