Here's a backward-compatibility hack that works on your minimal example. Maybe
it will save the dozens of files without changing all the &s:
\let\oldstartalign=\startalign
\let\oldstopalign=\stopalign
\let\oldbs=\\
\def\startalign{\catcode`&=4\let\\=\cr\oldstartalign}
\def\stopalign{\oldstopalign\catcode`&=12\let\\=\oldbs}
\starttext
This \& that & the other thing:
\startformula \startalign
v &= u + at \\
h &= ut + \frac12 gt^2 \\
\stopalign \stopformula
That \& this & yet another thing.
\stoptext
Hope that helps.
Michael
On Jul 17, 2012, at 6:48 PM, Matthias Weber wrote:
> It was never a problem in TeX to modify the control characters used according
> to your own pleasure. For me, the problem is now to change the 200+
> occurrences of start/stopaligns distributed over dozens of files to the
> politically correct syntax.
>
> Matthias
>
> On Jul 17, 2012, at 7:41 PM, Khaled Hosny <khaledho...@eglug.org> wrote:
>
>> The use of & (which is a common symbol) as a control character is a long
>> standing idiosyncrasy of TeX that I'm glad ConTeXt has got rid of.
>>
>> On Tue, Jul 17, 2012 at 07:32:09PM -0400, Matthias Weber wrote:
>>> Thanks - I wasn't aware that the human readable version had been deprecated
>>> :(
>>>
>>> Matthias
>>>
>>> On Jul 17, 2012, at 7:17 PM, Hans Hagen <pra...@wxs.nl> wrote:
>>>
>>>> On 18-7-2012 00:22, Matthias Weber wrote:
>>>>> \starttext
>>>>> \startformula \startalign
>>>>> v &= u + at \\
>>>>> h &= ut + \frac12 gt^2 \\
>>>>> \stopalign \stopformula
>>>>> \stoptext
>>>>>
>>>>>
>>>>> ---->>
>>>>>
>>>>> ConTeXt ver: 2012.07.17 16:42 MKIV fmt: 2012.7.17 int: english/english
>>>>> (...)
>>>>> ! Missing $ inserted.
>>>>>
>>>>> system > tex > error on line 3 in file test.tex: Missing $
>>>>> inserted ...
>>>>>
>>>>> 1 \starttext
>>>>> 2 \startformula \startalign
>>>>> 3 >> v &= u + at \\
>>>>> 4 h &= ut + \frac12 gt^2 \\
>>>>> 5 \stopalign \stopformula
>>>>> 6 \stoptext
>>>>>
>>>>> Thanks -
>>>>
>>>> the context way is:
>>>>
>>>> \startformula \startalign
>>>> \NC v \NC = u + at \NR
>>>> \NC h \NC = ut + \frac12 gt^2 \NR
>>>> \stopalign \stopformula
>>>>
>>>>
>>>> -----------------------------------------------------------------
>>>> Hans Hagen | PRAGMA ADE
>>>> Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>>>> tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
>>>> | www.pragma-pod.nl
>>>> -----------------------------------------------------------------
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