When user configure rewrite action with pattern param in GUI or CLI in NS 13.1, below error may prompt: "ERRO: No such argument [-pattern]" 

e.g 

> add rewrite action rwa_insert_intra_captcha_ag insert_before_all "HTTP.RES.BODY(8000).SET_TEXT_MODE(IGNORECASE)" q{"<td></td><td></td><td align=\"right\"><iframe src=\"/jcaptcha/jcaptcha.jpg\" height=\"100\" width=\"250\" frameborder=\"0\"></iframe><img id=\"PageRefresh\" src=\"/jcaptcha/images/Refresh_32.png\" onclick=\"javascript:window.location.href=window.location.href;\"> " + "<br><input id=\"\" class=\"CTXMSAM_ContentFont\" style=\"font-size: 20px\" type=\"text\" title=\"\" name=\"tsmcJcaptcha\" size=\"30\" maxlength=\"127\" onFocus=\"loginFieldCheck()\"style=\"width:100%; color=black;\" /></tr><tr>"} -pattern "<td></td><td></td><td align=\"right\">"
ERROR: No such argument [-pattern]
Usage: add rewrite action <name> <type> <target> [<stringBuilderExpr>] [-search <expression>] [-refineSearch <expression>] [-comment <string>]
>

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The nspepi upgrade tool can be useful in converting your configuration , more detail check the documentation .

Use nspepi tool available at https://github.com/citrix/ADC-scripts/tree/master/nspepi for the most complete and up-to-date version.

For pattern parameter, please use "-search" instead.

e.g.

Pattern param:

add rewrite action rwa_insert_intra_captcha_ag insert_before_all "HTTP.RES.BODY(8000).SET_TEXT_MODE(IGNORECASE)" q{"<td></td><td></td><td align=\"right\"><iframe src=\"/jcaptcha/jcaptcha.jpg\" height=\"100\" width=\"250\" frameborder=\"0\"></iframe><img id=\"PageRefresh\" src=\"/jcaptcha/images/Refresh_32.png\" onclick=\"javascript:window.location.href=window.location.href;\"> " + "<br><input id=\"\" class=\"CTXMSAM_ContentFont\" style=\"font-size: 20px\" type=\"text\" title=\"\" name=\"tsmcJcaptcha\" size=\"30\" maxlength=\"127\" onFocus=\"loginFieldCheck()\"style=\"width:100%; color=black;\" /></tr><tr>"} -pattern "<td></td><td></td><td align=\"right\">"

Search param:

add rewrite action rwa_insert_intra_captcha_ag insert_before_all "HTTP.RES.BODY(8000).SET_TEXT_MODE(IGNORECASE)" q{"<td></td><td></td><td align=\"right\"><iframe src=\"/jcaptcha/jcaptcha.jpg\" height=\"100\" width=\"250\" frameborder=\"0\"></iframe><img id=\"PageRefresh\" src=\"/jcaptcha/images/Refresh_32.png\" onclick=\"javascript:window.location.href=window.location.href;\"> " + "<br><input id=\"\" class=\"CTXMSAM_ContentFont\" style=\"font-size: 20px\" type=\"text\" title=\"\" name=\"tsmcJcaptcha\" size=\"30\" maxlength=\"127\" onFocus=\"loginFieldCheck()\"style=\"width:100%; color=black;\" /></tr><tr>"} -search q{text("<td></td><td></td><td align=\"right\">")}

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Problem Cause

The -pattern "<td></td><td></td><td align=\"right\">"parameter in the rewrite action was removed in 13.1