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<== Date ==> <== Thread ==>
Subject: Regex support in StreamDevice.
From: "Li, Ji via Tech-talk" <tech-talk at aps.anl.gov>
To: "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date: Thu, 12 May 2022 21:47:21 +0000
Hi,

We have an IOC based on streamdevice which had been work well until it was recently updated to base 7.0.5 and StreamDevice 2.8.10. The IOC reported erros on startup:

----------------------------------------------------------------------
2022/05/12 17:20:06.024569 _main_ No converter registered for format '%/'
2022/05/12 17:20:06.024610 _main_ var.p line 398: in format string: "%/^(?|\"([^\"]*)\"|([^\"][^ ]*))/"
2022/05/12 17:20:06.024616 _main_ var.p line 398: in command 'in'
2022/05/12 17:20:06.024620 _main_ var.p line 395: in protocol 'var_g_string'
2022/05/12 17:20:06.024627 _main_ while compiling protocol 'var_g_string(position.dim[0].name,XFM:MAIA)' for 'XFM:MAIA:X_POS_DIM_NAME'
2022/05/12 17:20:06.024633 _main_ XFM:MAIA:X_POS_DIM_NAME: Protocol parse error
2022/05/12 17:20:06.024639 _main_ XFM:MAIA:X_POS_DIM_NAME: Record initialization failed
----------------------------------------------------------------------

It seems "%/^(?|\"([^\"]*)\"|([^\"][^ ]*))/" in protocol var_g_string could not be recognized as a regular _expression_.

The StreamDevice was built against PCRE package, and:

----------------------------------------------------------------------
liji@xf04bm-maia:/epics/iocs/maia$ ldd bin/linux-x86_64/maia | grep pcre
libpcre2-8.so.0 => /lib64/libpcre2-8.so.0 (0x00007fcd23fdb000)
----------------------------------------------------------------------

What could be preventing streamdevice from parsing protocols with regular expressions?

Best,
-Ji

Replies:
AW: Regex support in StreamDevice. Zimoch Dirk (PSI) via Tech-talk
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