# Pattern Replace Token Filter not working with "c++"
**URL:** https://discuss.elastic.co/t/pattern-replace-token-filter-not-working-with-c/31929
**Category:** Elasticsearch
**Created:** [October 9, 2015, 5:46pm UTC](https://discuss.elastic.co/t/pattern-replace-token-filter-not-working-with-c/31929 "2015-10-09T17:46:07Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@acv2](https://discuss.elastic.co/u/acv2)
#### Post date: [October 9, 2015, 5:46pm UTC](https://discuss.elastic.co/t/pattern-replace-token-filter-not-working-with-c/31929/1 "2015-10-09T17:46:07Z")
im trying to test a replace "c++" with "cplusplus" which is sopposed to be easy thing... IT IS NOT haha
what im doing is the following..
"char\_filter": {
"replace\_key\_words": {
"type": "pattern\_replace",
"pattern": "c\\+\\+",
"replacement": "cplusplus"
}
}
it works if i set c@@ ... but as soon i try to use reserved character(+ or #) i doesn't work at all, maybe there is some hiden reason why this wouldnt work, hope you guys can help me with this mistery ^^
regards
Daniel
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 5, 2017, 11:45pm UTC](https://discuss.elastic.co/t/pattern-replace-token-filter-not-working-with-c/31929/2 "2017-07-05T23:45:37Z")